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Library of Congress Subject Areas (12)
- A General Works (32)
  - AC Collections. Series. Collected works (37)
  - AI Indexes (General) (32)
  - AM Museums (General). Collectors and collecting (General) (32)
  - AS Academies and learned societies (General) (43)
  - AZ History of Scholarship The Humanities (4)
  - ZUBYEK (1)
- B Philosophy. Psychology. Religion (5)
  - B Philosophy (General) (14)
  - BC Logic (2)
  - BF Psychology (4)
    - BF318 Learning, Psychology of (Deep learning) (7)
    - BF441 Critical thinking (4)
  - BH Aesthetics (15)
  - BJ Ethics (5)
  - BL Religion (4)
  - BP Islam. Bahaism. Theosophy, etc (14)
  - BR Christianity (1)
  - BS The Bible (1)
  - BV Practical Theology (3)
    - BV1460 Religious Education (3)
- T Technology (12)
  - T Technology (General) (528)
    - T11 Technical writing. Scientific Writing (105)
    - T174 Technological forecasting (257)
    - T174.5 Technology--Risk assessment. (361)
    - T201 Patents. Trademarks (12)
    - T385 Visualization--Technique (162)
    - T55 Industrial Safety (334)
    - T55.3.H3 Hazardous substances--Safety measures. (25)
    - T56.8 Project Management (749)
    - T57.5 Data Processing (846)
    - T57.6 Operations research--Mathematics. Goal programming (146)
    - T57.62 Simulation (727)
    - T57.74 Linear programming (103)
    - T57.8 Nonlinear programming. Support vector machine. Wavelets. Hidden Markov models. (146)
    - T57.83 Dynamic programming (102)
    - T57.84 Heuristic algorithms. (105)
    - T58.5 Information technology. IT--Auditing (439)
    - T58.6 Management information systems (803)
    - T58.62 Decision support systems (528)
    - T58.8 Productivity. Efficiency (400)
    - T59.7 Human-machine systems. (104)
    - TA404 Materials--Biodegradation (42)
  - TA Engineering (General). Civil engineering (General) (520)
    - TA1800 Fiber Optics (30)
    - TA357.5.S57 Sloshing (3)
    - TA 459 Metal foams. (5)
    - TA1573 Detectors. Sensors (87)
    - TA158.7 Computer network resources (38)
    - TA1637 Image processing--Digital techniques (520)
    - TA1650 Face recognition. Optical pattern recognition. (44)
    - TA167.5 Neurotechnology. Neuroadaptive systems (11)
    - TA169 Reliability (Engineering) (100)
    - TA169.5 Failure analysis (136)
    - TA174 Computer-aided design. (87)
    - TA1815 Optical fiber detectors. Bragg gratings. (3)
    - TA347 Finite Element Method (382)
    - TA355 Vibration. (52)
    - TA357 Computational fluid dynamics. Fluid Mechanics (133)
    - TA417.3 Magnetic testing. (5)
    - TA418.16 Materials--Testing. (97)
    - TA418.38 Materials--Fatigue. (61)
    - TA418.42 Hardness properties and tests. Hardness--Testing. (33)
    - TA418.74 Corrosion and anti-corrosives (210)
    - TA418.75 Corrosion-resistant materials (71)
    - TA418.9 Composite materials. Laminated materials. (273)
    - TA418.9.C57 Coatings (39)
    - TA418.9.F5 Electrospinning. Nanofibers (9)
    - TA433 Strength of materials. (42)
    - TA434 Inorganic polymers (4)
    - TA439 Lightweight concrete. High strength concrete. (22)
    - TA440 Concrete--Cracking. (100)
    - TA441 Aggregates (45)
    - TA443.A7 Asphalt (63)
    - TA444 Reinforced concrete (131)
    - TA455 Carbon. Nanotubes. (37)
    - TA455.A34 Adhesives (14)
    - TA455.G65 Graphene (14)
    - TA455.S6 Soil (Materials of engineering and construction) (170)
    - TA460 Metals--Fatigue. (21)
    - TA462 Metal Corrosion and protection against corrosion (56)
    - TA467 Iron and Steel Corrosion and protection against corrosion (48)
    - TA480.A6 Aluminum alloys. (12)
    - TA491 Metal coating. (46)
    - TA492.G5 Girders (25)
    - TA492.W4 Welded joints (38)
    - TA590 Topographical surveying (32)
    - TA593 Orthophotography (5)
    - TA593.35 Instruments, cameras, etc. (37)
    - TA645 Structural analysis (Engineering) (639)
    - TA656.2 Buckling (26)
    - TA658 Structural design (311)
    - TA660.C6 Columns (45)
    - TA660.F7 Structural frames. (54)
    - TA660.P55 Underground pipeline design, construction and management (37)
    - TA660.T34 Tanks. Pressure vessels (20)
    - TA681 Concrete construction (320)
    - TA683 Precast concrete construction. Prestressed concrete construction. (196)
    - TA749 Soil stabilization (232)
    - TA760+ Retaining walls (54)
    - TA775 Foundations. (149)
    - TA780 Piles and pile-driving (64)
    - TA780.C29 Piling (Civil engineering) (37)
  - TC Hydraulic engineering. Ocean engineering (8)
    - TC147 Ocean wave power. (136)
    - TC1665 Offshore structures--Materials. (101)
    - TC167 Dams, reservoirs (143)
    - TC1680 Offshore structures (487)
    - TC173 Orifices. Nozzles. Jets (4)
    - TC175.2 Sediment transport (76)
    - TC187 Dredging (10)
    - TC188 Dredges (3)
    - TC203.5 Coastal engineering (97)
    - TC205 Harbors--Design and construction. (93)
    - TC333 Breakwaters (61)
    - TC335 Sea-walls--Design and construction (6)
    - TC343+ Reclamation of land from the sea (8)
    - TC357 Harbor Engineering. Piers, quays, and wharves (96)
    - TC363 Floating harbors. Including floating docks, piers, etc (30)
    - TC424 Water levels (76)
    - TC530 Flood control (84)
    - TC555 Spillways. Energy dissipation. Hydraulic jump. (49)
    - TC801 Reclamation of land (8)
    - TC812 Irrigation (108)
  - TD Environmental technology. Sanitary engineering (13)
    - TD171.75 Climate change mitigation (97)
    - TD192.5 Bioremediation (52)
    - TD192.75 Phytoremediation. (11)
    - TD194.6 Environmental impact analysis (151)
    - TD195.B56 Biomass energy (62)
    - TD195.S47 Sewage disposal plants--Environmental aspects (19)
    - TD233 Water consumption (64)
    - TD259.2 Drinking water. Water quality (137)
    - TD375 Turbidity--Measurement. (22)
    - TD395 Reservoirs (water supply) (62)
    - TD418 Water harvesting (27)
    - TD420 Water pollution (127)
    - TD427.F58 Fly ash (12)
    - TD427.P62 Microplastics--Environmental aspects. (13)
    - TD430 Water--Purification. (81)
    - TD433 Water treatment plants (162)
    - TD455 Chemical precipitation. Coagulation. Flocculation. Water--Purification--Flocculation. (45)
    - TD479.3 Saline water conversion (13)
    - TD480.5 Electrodialysis (10)
    - TD481 Water distribution systems (135)
    - TD491 Spillways (14)
    - TD646 Sewage--Purification (187)
    - TD678 Ocean outfalls--Design and construction. (1)
    - TD747 Sewage disposal plants--Odor control (1)
    - TD756.45 Anaerobic treatment (29)
    - TD767.7 Sewage sludge treatment and disposal (73)
    - TD789 Refuse and refuse disposal (91)
    - TD794.5 Recycling (Waste, etc.) (22)
    - TD795.7 Sanitary landfills. Leachate--Purification. (32)
    - TD796 Incineration. Incinerators (7)
    - TD796.5 Composting (21)
    - TD799.85 Electronic apparatus and appliances waste (10)
    - TD878.47 Soil remediation (30)
    - TD883 Air quality management. (41)
    - TD883.2 Automobiles--Motors--Exhaust gas (9)
    - TD883.5 Air--Pollution (221)
    - TD886.5 Motor vehicles--Motors--Exhaust gas--Environmental aspects. (12)
    - TD887.B58 Air pollutants. Bituminous materials (14)
    - TD890 Global Environmental Monitoring System (52)
    - TD892 Noise control (43)
    - TD898.8.C67 Waste disposal (102)
    - TD899 Waste control in special industries, plants, processes, etc (69)
    - TD899.S68 Steam power plants (39)
  - TE Highway engineering. Roads and pavements (53)
    - TE175 Road and highway design (197)
    - TE215 Drainage (93)
    - TE228.3 Intelligent transportation systems. (31)
    - TE228.37 Vehicular ad hoc networks (Computer networks) (18)
    - TE250.P475 Pavements--Design and construction--Estimates. (13)
    - TE251.T74 Pavements--Design and construction (39)
    - TE278.D523 Pavements, Concrete--Testing. (12)
    - TE7 TG300 Bridges--Design and construction. (46)
    - TE7 Transportation--Planning (512)
    - TE7.H5 Airports--Planning. Airport terminals--Planning (53)
  - TF Railroad engineering and operation (29)
    - TF1327.O58 High speed ground transportation (train) (24)
    - TF193 Estimates, costs, etc. (64)
    - TF240 Railway construction (29)
    - TF270 Railway structures and buildings (47)
    - TF4 Railroads--Automation. (5)
    - TF652 Station management (16)
    - TF872 Rails (Track) (18)
  - TG Bridge engineering (166)
    - TG362 Box girder bridges--Design and construction. (32)
  - TH Building construction (35)
    - TH1.N48 Sandwich construction. (1)
    - TH1095 Earthquakes and building (132)
    - TH11 Builders' and contractors' bulletins. Including prices, permits, etc. (36)
    - TH1461 Concrete construction. (119)
    - TH2247 Shear walls--Materials (11)
    - TH2486 Skylights and ventilators (19)
    - TH2521 Floors and flooring (17)
    - TH3000 Basements--Remodeling. (19)
    - TH3351 Maintenance and repair (46)
    - TH385 Building layout. (62)
    - TH437 Building--Cost control. (211)
    - TH438 Construction industry--Management. Project management. (367)
    - TH438.13 Building information modeling. (56)
    - TH4811 House construction (38)
    - TH4860 Ecological houses--Design and construction. (15)
    - TH6515 Plumbing. (19)
    - TH6840 Piping installation. Pipefitting (32)
    - TH6882 Flame monitors Ignition devices Including electric ignitors (6)
    - TH7687.7 Cooling Systems and details (23)
    - TH7703 Illumination. Lighting (31)
    - TH880 Sustainable buildings. Sustainable construction. Green building (97)
    - TH900+ Construction equipment in building construction (35)
    - TH9737 Electronic security systems (18)
    - TH9745.D85 Dwellings (22)
  - TJ Mechanical engineering and machinery (54)
    - TJ1058 Rotors (33)
    - TJ1077 Lubrication and lubricants. (27)
    - TJ1185 Metal-cutting--Problems, exercises, etc. (20)
    - TJ1186 Metal-cutting tools. (26)
    - TJ1186.B5 Metal-cutting tools--Design and construction. (18)
    - TJ1225 Milling machines numerically controlled (22)
    - TJ1230 Cutting and sawing machinery (39)
    - TJ1363 Cranes, derricks, etc. (23)
    - TJ1398 Conveyors (53)
    - TJ164 Power plants--Design and construction (264)
    - TJ165 Energy storage. (100)
    - TJ174 Maintenance and repair of machinery (176)
    - TJ211 Robotics. (160)
    - TJ211.4 Robot motion (48)
    - TJ211.415 Mobile robots (71)
    - TJ213 Automatic control. (235)
    - TJ217 Adaptive control systems (54)
    - TJ217.2 Robust control (31)
    - TJ217.6 Predictive Control (115)
    - TJ219 Pneumatic control systems (32)
    - TJ222 Supervisory control systems. (21)
    - TJ223 PID controllers (319)
    - TJ223.A25 Actuators. (7)
    - TJ223.P76 Programmable controllers (74)
    - TJ230 Machine design (523)
    - TJ254.7 Combustion chambers (33)
    - TJ263 Heat exchangers (234)
    - TJ263.5 Boilers (general) (99)
    - TJ265.E23 Thermodynamics. (48)
    - TJ266 Turbines. Turbomachines (General) (101)
    - TJ324.5 Fuel systems (71)
    - TJ357 Pressure regulators (6)
    - TJ541 Flywheels. (13)
    - TJ561 Surface (22)
    - TJ669.B7 Locomotive brakes (7)
    - TJ700 Traction engines, etc. (5)
    - TJ762.E93 Exhaust systems (14)
    - TJ778 Gas turbines (52)
    - TJ785 Internal combustion engines. Spark ignition (93)
    - TJ797 Diesel motor--Fuel systems--Testing. (7)
    - TJ799 Diesel motor--Electronic control. (151)
    - TJ808 Renewable energy sources. Energy harvesting. (246)
    - TJ810.5 Solar energy (116)
    - TJ820 Wind power (51)
    - TJ828 Wind turbines (164)
    - TJ840.A2+ hydraulic machinery (12)
    - TJ870 Hydraulic turbines. (23)
    - TJ903 Pumping machinery. (79)
    - TJ910 Electric pumping machinery (20)
    - TJ919 Centrifugal pumps--Design and construction. (60)
    - TJ930 Pipelines (General). Underwater pipelines. (68)
    - TJ935 Pipe--Fluid dynamics. Tubes--Fluid dynamics (160)
    - TJ950 Pneumatic machinery (27)
    - TJ990 Compressors (40)
  - TK Electrical engineering. Electronics Nuclear engineering (4)
    - TK1001 Production of electric energy or power (221)
    - TK1007 Electric power systems control (180)
    - TK1010 Electric power system stability. Electric filters, Passive. (204)
    - TK105.8883 Web authoring software (include web server) (35)
    - TK1056 Solar power plants. Ocean thermal power plants (75)
    - TK1073 Ocean thermal energy conversion (12)
    - TK1087 Photovoltaic power generation (201)
    - TK1318 Geothermal Power Plants (42)
    - TK1322.6 Electric power-plants (200)
    - TK1519.S68 Hydroelectric power plants (36)
    - TK152.A75 Electrical engineering--Safety measures (18)
    - TK153 Electric power factor. Lightning protection. (14)
    - TK201 Electric Power Transmission (348)
    - TK2211 Eddy currents (Electric) (1)
    - TK2551 Electric transformers. (47)
    - TK2681.B47 Electric motors, Direct current. (50)
    - TK2681.O85 Electric motors, Brushless. (35)
    - TK2692 Inverters (30)
    - TK2785 Electric motors, Induction. (143)
    - TK2791 D.C. to A.C. transforming machinery. (11)
    - TK2797 Motor-generator sets. Cascade (28)
    - TK2851 Voltage regulators. (19)
    - TK2861 Electric relays. Protective relays--Security measures. (181)
    - TK2921 Lithium cells. (68)
    - TK2931 Fuel cells (38)
    - TK2941 Storage batteries (80)
    - TK2943 Battery chargers. (13)
    - TK2945 Lead-acid batteries. (39)
    - TK2950 Thermoelectric materials. (10)
    - TK2960 Dye-sensitized solar cells. Solar batteries. Solar cells (54)
    - TK3030 Electric power distribution systems (128)
    - TK3070 Automatic control (234)
    - TK3226 Transients (Electricity). Electric power systems. Harmonics (Electric waves). (240)
    - TK3401 Insulation and insulating materials (63)
    - TK351 Electric measurements. (73)
    - TK4035.R4 Refrigeration and refrigerating machinery (32)
    - TK4055 Electric motor (78)
    - TK452 Electric apparatus and materials (20)
    - TK4660 Welding; Electric welding. (3)
    - TK5101 Telecommunication (289)
    - TK5102.5 Modulation (Electronics), Demodulation (Electronics) (56)
    - TK5102.9 Signal processing. (180)
    - TK5102.94 Cryptographic techniques (17)
    - TK5103.2 Wireless communication systems. Two way wireless communication (215)
    - TK5103.484 Orthogonal frequency division multiplexing. (5)
    - TK5103.8 Switching systems (20)
    - TK5105 Data Transmission Systems (209)
    - TK5105.543 Routers (Computer networks) (17)
    - TK5105.546 Computer algorithms (320)
    - TK5105.585 TCP/IP (Computer network protocol) (89)
    - TK5105.5956 Quality of service. Reliability Including network performance (56)
    - TK5105.888 Web sites--Design. Web site development. (242)
    - TK5105.88815 Semantic Web (10)
    - TK531 Current and voltage waveforms (16)
    - TK6401+ telephone systems and instruments (5)
    - TK6564 Radio transmitter-receivers (56)
    - TK6564.4.C45 Cell phones (4)
    - TK6565.P3 Panels (6)
    - TK6565.T7 Transformers (35)
    - TK6570_iPhone (Smartphone). RFID. Mobile communication systems. (64)
    - TK6592.A9 Automatic tracking. (13)
    - TK6592.O6 Optical radar (11)
    - TK6630 Television (3)
    - TK7 Turbogenerators. Steam-turbines (18)
    - TK7867.5 Noise (10)
    - TK7868.P6 Power supply (31)
    - TK7870.23 Reliability. Failures (65)
    - TK7871.58 Audio amplifiers--Design and construction. (9)
    - TK7871.6 Antennas (Electronics) (92)
    - TK7871.674 Detectors. Sensors (229)
    - TK7872 Electric current converters, Electric inverters. (183)
    - TK7872 Electromagnetic Devices (77)
    - TK7872.C65 Supercapacitors. (4)
    - TK7872.C8 Current converters (9)
    - TK7872.F5 Filters (Electric) (10)
    - TK7878 Electronic instruments (188)
    - TK7882.B56 Biometric identification (16)
    - TK7882.P3 Pattern recognition systems (82)
    - TK7888.3 Digital computers (33)
    - TK7895.G36 Field programmable gate arrays--Design and construction. (6)
    - TK7895.S65 Speech recognition systems (16)
    - TK9956 Radio. Wireless telephone (13)
  - TL Motor vehicles. Aeronautics. Astronautics (12)
    - TL152.5 Motor vehicles Driving (46)
    - TL152.8 Vehicles, Remotely piloted. Autonomous vehicles. (113)
    - TL175 Parking facilities (39)
    - TL210 Automobiles--Lubrication systems. (8)
    - TL214 Automobiles--Motors--Pistons and piston rings. (14)
    - TL214.T87 Automobiles--Motors--Turbochargers (12)
    - TL220 Electric vehicles and their batteries, etc. (178)
    - TL220.5 Battery charging stations (Electric vehicles) (7)
    - TL221.5 Hybrid Vehicles. Hybrid cars (38)
    - TL229.D5 Diesel automobiles (17)
    - TL240.5 Composite materials (93)
    - TL257 Springs and suspension (32)
    - TL257.5 Automobiles--Shock absorbers--Design and construction. (66)
    - TL262 Automobiles--Transmission devices--Design and construction. (4)
    - TL269.C474 Brakes--Maintenance and repair (20)
    - TL270 Automobiles--Wheels--Alignment. (10)
    - TL275.J6 Automobiles--Maintenance and repair. (11)
    - TL410 Bicycles and bicycling--Design and construction (30)
    - TL440 Motorcycles. (26)
    - TL445.M369 Motorcycles--Electric equipment--Maintenance and repair. (9)
    - TL448 Electric motorcycles (52)
    - TL507.G77 Vortex generators. (10)
    - TL521 Aerodynamics, Hypersonic. (49)
    - TL521.3 Automatic Control (234)
    - TL574.C3 Cascade (7)
    - TL589.2.N3 Navigation computer (17)
    - TL671.6. Materials--Fatigue. (30)
    - TL671.9 Airplanes--Maintenance and Repair (16)
    - TL673.F6 Flaps (Airplane) (3)
    - TL681.A5 Air conditioning (Aeronautics ) (9)
    - TL696.C6 Airplanes--Collision avoidance (7)
    - TL697.P6 Pneumatic equipment (7)
    - TL725 Airport terminals. (4)
    - TL725.3 Traffic Control (36)
    - TL725.3.B8 Airport buildings. (5)
    - TL725.3.P5 Airports--Planning. Airports--Design and construction. (7)
    - TL725.3.R8 Runways (6)
    - TL725.3.T7 Air traffic control (4)
    - TL776 .N67 Quadrotor helicopters--Automatic control (27)
    - TL777 Details and parts of models (Including propellers) (10)
    - TL798.N3 Global Positioning System. (16)
  - TN Mining engineering. Metallurgy (29)
    - TN23 Metal cladding. (9)
    - TN24 Aquifers (2)
    - TN269 Prospecting--Geophysical methods (43)
    - TN271.K2 Kaolin (5)
    - TN295 Fly ash (21)
    - TN408.N56 Sand, Iron (6)
    - TN490 Zircon mines and mining (3)
    - TN677 Blast furnaces. (20)
    - TN687 Electric furnaces. (13)
    - TN688 Hydrometallurgy (30)
    - TN689+ Physical metallurgy (16)
    - TN690 Metallography. Physical metallurgy (104)
    - TN693.M3 Magnesium (10)
    - TN752.I5 Steel--Heat treatment (157)
    - TN752.Q4 Metals--Quenching (6)
    - TN775 Aluminum alloys--Metallurgy. (25)
    - TN799.N6 Nickel--Metallurgy (29)
    - TN871.3 Offshore well drilling (23)
    - TN879.5 Petroleum pipelines (51)
    - TN879.6 Welding (69)
    - TN880.5 Natural gas pipelines (33)
  - TP Chemical technology (61)
    - TP1140 Polymers (197)
    - TP1151 Special molding and casting processes (7)
    - TP1175.S6 Spraying Coating with plastics (5)
    - TP155.5 Chemical plants--Design and construction (253)
    - TP155.7 Chemical processes. (45)
    - TP156 Crystallization. Extraction (Chemistry). Fermentation. Distillation. Emulsions. (260)
    - TP156.C64 Controlled release technology (3)
    - TP159.A5 Antioxidants (6)
    - TP159.M4 Membranes (Technology) (30)
    - TP159.M6 Zeolites (18)
    - TP159.S4 Separators (Machine) (30)
    - TP245.C3 Calcium carbonate. (14)
    - TP245.S5 Silica gel. (4)
    - TP248 Nanogels. Nanoparticles. (117)
    - TP248.25.B55 Bioreactors--Fluid dynamics. (3)
    - TP248.25.M45 Membrane reactors (10)
    - TP248.25.M46 Membrane separation (41)
    - TP248.25.N35 Microencapsulation. (4)
    - TP248.27.P55 Plant biotechnology. (9)
    - TP248.3 Biochemical engineering. Bioprocess engineering (71)
    - TP248.65.C55 Chitosan--Biotechnology. (15)
    - TP248.65.P76 Proteins--Biotechnology. (2)
    - TP255 Electrochemistry, Industrial. (142)
    - TP339 Ethanol as fuel. Biomass energy. (76)
    - TP343 Liquid and gaseous fuel (76)
    - TP350 Natural gas--Drying. (61)
    - TP359 Biogas (86)
    - TP359.B46 Biodiesel fuels. (52)
    - TP370 Food processing and manufacture (83)
    - TP382 Sugar--Analysis. (9)
    - TP451.E3 Edible coatings. (5)
    - TP492.3 Refrigeration and refrigerating machinery (23)
    - TP669 Oils, fats, and waxes (43)
    - TP692.5 Oil and gasoline handling and storage (48)
    - TP761.L5 Liquefied natural gas (16)
    - TP845+ Glass manufacture (1)
    - TP883 Portland cement. (17)
    - TP884.L5 Lightweight concrete (4)
    - TP894 Bleaching, cleaning, scouring (8)
    - TP994 Surface active agents. (14)
  - TR Photography (2)
    - TR260.7 Autofocus cameras (5)
    - TR263.S37 Sea & Sea cameras. (2)
    - TR267.733.M85 Multispectral imaging (15)
    - TR810 Aerial photography (8)
    - TR845 Cinematography. Video recordings. (29)
    - TR897.5 Animation (Cinematography) (7)
    - TR897.7 Computer animation (51)
  - TS Manufactures (28)
    - TS1017 Athletic shoes (4)
    - TS155 Production control. Production planning. Production management (197)
    - TS156 Quality Control. QFD. Taguchi methods (Quality control) (351)
    - TS157.5 Production scheduling (50)
    - TS161 Materials management. (36)
    - TS167 Costs, Industrial (172)
    - TS170 New products. Product Development (183)
    - TS171 Product design (405)
    - TS173 Reliability of industrial products (51)
    - TS174 Maintainability (Engineering) . Reliability (Engineering) (121)
    - TS176 Manufacturing engineering. Process engineering (Including manufacturing planning, production planning) (235)
    - TS183 Manufacturing processes. Lean manufacturing. (84)
    - TS195 Packaging (29)
    - TS205 Metals--Heat treatment. (38)
    - TS227 Welding. (119)
    - TS2301.T7 Toys, etc (8)
    - TS233 Sand casting. Metal castings--Thermal properties. (22)
    - TS253 Die-Casting (29)
    - TS280 Pipe Bending, Tube Bending (40)
    - TS283 Pressure vessels. (14)
    - TS320 Steel--Metallurgy. (28)
    - TS670 Electroplating (4)
    - TS695 Physical/Chemical vapor deposition (7)
    - TS699 Powder coating of metals (28)
  - TT Handicrafts Arts and crafts (1)
    - TT149 Craft festivals--Planning. (1)
    - TT157 Handicraft. (3)
    - TT199.7 Wood-carving. (4)
  - TX Home economics (6)
    - TX349 Nutrition. Foods and food supply (17)
    - TX911.2 Hotels--Design and construction. (6)
    - TX911.3.P46 Hotels--Planning. (2)
- C Auxiliary Sciences of History (1)
  - C Auxiliary sciences of history (General) (4)
  - CB History of civilization (3)
  - CC Archaeology (8)
  - CE Technical chronology. Calendar (2)
  - CT Biography (1)
- D History General and Old World (1)
  - D History (General) (1)
    - D051 Ancient History (12)
    - D111 Medieval History (2)
    - D204 Modern History (4)
    - D731 World War II (4)
    - D839 Post-war History, 1945 on (4)
    - D880 Developing Countries (1)
    - D901 Europe (General) (1)
  - DF Greece (1)
  - DJ Netherlands (Holland) (2)
  - DS Asia (8)
  - DT Africa (1)
  - DU Oceania (South Seas) (1)
- E History America (1)
  - E151 United States (General) (1)
- G Geography. Anthropology. Recreation (11)
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