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Library of Congress Subject Areas (3)
- A General Works (17)
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  - AI Indexes (General) (17)
  - AM Museums (General). Collectors and collecting (General) (23)
  - AS Academies and learned societies (General) (26)
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- B Philosophy. Psychology. Religion (1)
  - B Philosophy (General) (8)
  - BC Logic (1)
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  - BH Aesthetics (8)
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  - BL Religion (2)
  - BP Islam. Bahaism. Theosophy, etc (10)
  - BV Practical Theology (3)
    - BV1460 Religious Education (3)
- T Technology (40)
  - T Technology (General) (528)
    - T11 Technical writing. Scientific Writing (26)
    - T174 Technological forecasting (132)
    - T174.5 Technology--Risk assessment. (193)
    - T201 Patents. Trademarks (11)
    - T385 Visualization--Technique (57)
    - T55 Industrial Safety (221)
    - T56.8 Project Management (528)
    - T57.5 Data Processing (434)
    - T57.6 Operations research--Mathematics. Goal programming (84)
    - T57.62 Simulation (378)
    - T57.74 Linear programming (38)
    - T57.8 Nonlinear programming. Support vector machine. Wavelets. Hidden Markov models. (60)
    - T57.83 Dynamic programming (52)
    - T57.84 Heuristic algorithms. (50)
    - T58.5 Information technology. IT--Auditing (264)
    - T58.6 Management information systems (507)
    - T58.62 Decision support systems (380)
    - T58.8 Productivity. Efficiency (184)
    - TA404 Materials--Biodegradation (19)
  - TA Engineering (General). Civil engineering (General) (54)
    - TA1800 Fiber Optics (18)
    - TA357.5.S57 Sloshing (3)
    - TA1573 Detectors. Sensors (48)
    - TA158.7 Computer network resources (30)
    - TA1637 Image processing--Digital techniques (383)
    - TA1650 Face recognition. Optical pattern recognition. (28)
    - TA167.5 Neurotechnology. Neuroadaptive systems (7)
    - TA169 Reliability (Engineering) (71)
    - TA169.5 Failure analysis (57)
    - TA174 Computer-aided design. (54)
    - TA1815 Optical fiber detectors. Bragg gratings. (2)
    - TA347 Finite Element Method (258)
    - TA355 Vibration. (30)
    - TA357 Computational fluid dynamics. Fluid Mechanics (89)
    - TA417.3 Magnetic testing. (2)
    - TA418.16 Materials--Testing. (35)
    - TA418.38 Materials--Fatigue. (42)
    - TA418.42 Hardness properties and tests. Hardness--Testing. (18)
    - TA418.74 Corrosion and anti-corrosives (167)
    - TA418.75 Corrosion-resistant materials (24)
    - TA418.9 Composite materials. Laminated materials. (230)
    - TA418.9.C57 Coatings (13)
    - TA418.9.F5 Electrospinning. Nanofibers (2)
    - TA439 Lightweight concrete. High strength concrete. (10)
    - TA440 Concrete--Cracking. (64)
    - TA441 Aggregates (31)
    - TA443.A7 Asphalt (42)
    - TA444 Reinforced concrete (74)
    - TA455 Carbon. Nanotubes. (27)
    - TA455.A34 Adhesives (7)
    - TA455.G65 Graphene (5)
    - TA455.S6 Soil (Materials of engineering and construction) (105)
    - TA460 Metals--Fatigue. (14)
    - TA462 Metal Corrosion and protection against corrosion (21)
    - TA467 Iron and Steel Corrosion and protection against corrosion (23)
    - TA480.A6 Aluminum alloys. (3)
    - TA491 Metal coating. (34)
    - TA492.G5 Girders (12)
    - TA492.W4 Welded joints (24)
    - TA590 Topographical surveying (19)
    - TA593.35 Instruments, cameras, etc. (24)
    - TA645 Structural analysis (Engineering) (493)
    - TA656.2 Buckling (14)
    - TA658 Structural design (184)
    - TA660.C6 Columns (22)
    - TA660.F7 Structural frames. (24)
    - TA660.P55 Underground pipeline design, construction and management (24)
    - TA660.T34 Tanks. Pressure vessels (10)
    - TA681 Concrete construction (255)
    - TA683 Precast concrete construction. Prestressed concrete construction. (156)
    - TA749 Soil stabilization (159)
    - TA760+ Retaining walls (34)
    - TA775 Foundations. (89)
    - TA780 Piles and pile-driving (36)
    - TA780.C29 Piling (Civil engineering) (29)
  - TC Hydraulic engineering. Ocean engineering (15)
    - TC147 Ocean wave power. (109)
    - TC1665 Offshore structures--Materials. (61)
    - TC167 Dams, reservoirs (64)
    - TC1680 Offshore structures (376)
    - TC173 Orifices. Nozzles. Jets (2)
    - TC175.2 Sediment transport (34)
    - TC203.5 Coastal engineering (52)
    - TC205 Harbors--Design and construction. (71)
    - TC333 Breakwaters (24)
    - TC343+ Reclamation of land from the sea (2)
    - TC357 Harbor Engineering. Piers, quays, and wharves (73)
    - TC363 Floating harbors. Including floating docks, piers, etc (15)
    - TC424 Water levels (41)
    - TC530 Flood control (32)
    - TC555 Spillways. Energy dissipation. Hydraulic jump. (28)
    - TC801 Reclamation of land (5)
    - TC812 Irrigation (73)
  - TD Environmental technology. Sanitary engineering (173)
    - TD171.75 Climate change mitigation (36)
    - TD192.5 Bioremediation (32)
    - TD194.6 Environmental impact analysis (70)
    - TD195.B56 Biomass energy (37)
    - TD195.S47 Sewage disposal plants--Environmental aspects (7)
    - TD233 Water consumption (33)
    - TD259.2 Drinking water. Water quality (82)
    - TD375 Turbidity--Measurement. (16)
    - TD395 Reservoirs (water supply) (39)
    - TD418 Water harvesting (14)
    - TD420 Water pollution (69)
    - TD427.F58 Fly ash (6)
    - TD427.P62 Microplastics--Environmental aspects. (3)
    - TD430 Water--Purification. (63)
    - TD433 Water treatment plants (85)
    - TD455 Chemical precipitation. Coagulation. Flocculation. Water--Purification--Flocculation. (29)
    - TD479.3 Saline water conversion (11)
    - TD480.5 Electrodialysis (5)
    - TD481 Water distribution systems (72)
    - TD491 Spillways (12)
    - TD646 Sewage--Purification (173)
    - TD756.45 Anaerobic treatment (11)
    - TD767.7 Sewage sludge treatment and disposal (51)
    - TD789 Refuse and refuse disposal (84)
    - TD795.7 Sanitary landfills. Leachate--Purification. (12)
    - TD796 Incineration. Incinerators (7)
    - TD796.5 Composting (6)
    - TD799.85 Electronic apparatus and appliances waste (4)
    - TD878.47 Soil remediation (20)
    - TD883 Air quality management. (17)
    - TD883.2 Automobiles--Motors--Exhaust gas (6)
    - TD883.5 Air--Pollution (159)
    - TD886.5 Motor vehicles--Motors--Exhaust gas--Environmental aspects. (4)
    - TD887.B58 Air pollutants. Bituminous materials (8)
    - TD890 Global Environmental Monitoring System (25)
    - TD892 Noise control (32)
    - TD898.8.C67 Waste disposal (48)
    - TD899 Waste control in special industries, plants, processes, etc (28)
    - TD899.S68 Steam power plants (21)
  - TE Highway engineering. Roads and pavements (5)
    - TE175 Road and highway design (143)
    - TE215 Drainage (66)
    - TE228.3 Intelligent transportation systems. (14)
    - TE228.37 Vehicular ad hoc networks (Computer networks) (17)
    - TE251.T74 Pavements--Design and construction (20)
    - TE278.D523 Pavements, Concrete--Testing. (5)
    - TE7 TG300 Bridges--Design and construction. (34)
    - TE7 Transportation--Planning (384)
    - TE7.H5 Airports--Planning. Airport terminals--Planning (39)
  - TF Railroad engineering and operation (6)
    - TF1327.O58 High speed ground transportation (train) (17)
    - TF193 Estimates, costs, etc. (42)
    - TF240 Railway construction (14)
    - TF270 Railway structures and buildings (29)
    - TF4 Railroads--Automation. (4)
    - TF652 Station management (6)
    - TF872 Rails (Track) (8)
  - TG Bridge engineering (19)
    - TG362 Box girder bridges--Design and construction. (19)
  - TH Building construction (6)
    - TH1095 Earthquakes and building (80)
    - TH11 Builders' and contractors' bulletins. Including prices, permits, etc. (11)
    - TH1461 Concrete construction. (75)
    - TH2247 Shear walls--Materials (7)
    - TH2486 Skylights and ventilators (6)
    - TH2521 Floors and flooring (4)
    - TH3000 Basements--Remodeling. (12)
    - TH3351 Maintenance and repair (36)
    - TH385 Building layout. (25)
    - TH437 Building--Cost control. (146)
    - TH438 Construction industry--Management. Project management. (206)
    - TH438.13 Building information modeling. (18)
    - TH4811 House construction (13)
    - TH4860 Ecological houses--Design and construction. (3)
    - TH6515 Plumbing. (4)
    - TH6840 Piping installation. Pipefitting (14)
    - TH6882 Flame monitors Ignition devices Including electric ignitors (2)
    - TH7687.7 Cooling Systems and details (11)
    - TH7703 Illumination. Lighting (13)
    - TH880 Sustainable buildings. Sustainable construction. Green building (44)
    - TH900+ Construction equipment in building construction (16)
    - TH9737 Electronic security systems (6)
    - TH9745.D85 Dwellings (6)
  - TJ Mechanical engineering and machinery (40)
    - TJ1058 Rotors (16)
    - TJ1077 Lubrication and lubricants. (14)
    - TJ1185 Metal-cutting--Problems, exercises, etc. (7)
    - TJ1186 Metal-cutting tools. (17)
    - TJ1186.B5 Metal-cutting tools--Design and construction. (13)
    - TJ1225 Milling machines numerically controlled (7)
    - TJ1230 Cutting and sawing machinery (25)
    - TJ1363 Cranes, derricks, etc. (14)
    - TJ1398 Conveyors (41)
    - TJ164 Power plants--Design and construction (196)
    - TJ165 Energy storage. (40)
    - TJ174 Maintenance and repair of machinery (94)
    - TJ211 Robotics. (90)
    - TJ211.4 Robot motion (21)
    - TJ211.415 Mobile robots (43)
    - TJ213 Automatic control. (172)
    - TJ217 Adaptive control systems (17)
    - TJ217.2 Robust control (16)
    - TJ217.6 Predictive Control (95)
    - TJ219 Pneumatic control systems (24)
    - TJ222 Supervisory control systems. (18)
    - TJ223 PID controllers (253)
    - TJ223.P76 Programmable controllers (55)
    - TJ230 Machine design (406)
    - TJ254.7 Combustion chambers (21)
    - TJ263 Heat exchangers (160)
    - TJ263.5 Boilers (general) (42)
    - TJ265.E23 Thermodynamics. (15)
    - TJ266 Turbines. Turbomachines (General) (56)
    - TJ324.5 Fuel systems (53)
    - TJ357 Pressure regulators (3)
    - TJ541 Flywheels. (4)
    - TJ561 Surface (12)
    - TJ669.B7 Locomotive brakes (6)
    - TJ700 Traction engines, etc. (5)
    - TJ762.E93 Exhaust systems (4)
    - TJ778 Gas turbines (34)
    - TJ785 Internal combustion engines. Spark ignition (73)
    - TJ799 Diesel motor--Electronic control. (133)
    - TJ808 Renewable energy sources. Energy harvesting. (105)
    - TJ810.5 Solar energy (65)
    - TJ820 Wind power (36)
    - TJ828 Wind turbines (135)
    - TJ840.A2+ hydraulic machinery (3)
    - TJ870 Hydraulic turbines. (9)
    - TJ903 Pumping machinery. (47)
    - TJ910 Electric pumping machinery (14)
    - TJ919 Centrifugal pumps--Design and construction. (30)
    - TJ930 Pipelines (General). Underwater pipelines. (40)
    - TJ935 Pipe--Fluid dynamics. Tubes--Fluid dynamics (130)
    - TJ950 Pneumatic machinery (16)
    - TJ990 Compressors (27)
  - TK Electrical engineering. Electronics Nuclear engineering (34)
    - TK1001 Production of electric energy or power (145)
    - TK1007 Electric power systems control (93)
    - TK1010 Electric power system stability. Electric filters, Passive. (147)
    - TK105.8883 Web authoring software (include web server) (26)
    - TK1056 Solar powerplants (34)
    - TK1073 Ocean thermal energy conversion (10)
    - TK1087 Photovoltaic power generation (123)
    - TK1318 Geothermal Power Plants (34)
    - TK1322.6 Electric power-plants (135)
    - TK1519.S68 Hydroelectric power plants (24)
    - TK153 Electric power factor. (2)
    - TK201 Electric Power Transmission (316)
    - TK2211 Eddy currents (Electric) (1)
    - TK2551 Electric transformers. (26)
    - TK2681.B47 Electric motors, Direct current. (24)
    - TK2681.O85 Electric motors, Brushless. (20)
    - TK2692 Inverters (12)
    - TK2785 Electric motors, Induction. (105)
    - TK2791 D.C. to A.C. transforming machinery. (7)
    - TK2797 Motor-generator sets. Cascade (23)
    - TK2851 Voltage regulators. (10)
    - TK2861 Electric relays (131)
    - TK2921 Lithium cells. (33)
    - TK2931 Fuel cells (22)
    - TK2941 Storage batteries (31)
    - TK2945 Lead-acid batteries. (25)
    - TK2950 Thermoelectric materials. (3)
    - TK2960 Dye-sensitized solar cells. Solar batteries. Solar cells (46)
    - TK3030 Electric power distribution systems (69)
    - TK3070 Automatic control (113)
    - TK3226 Transients (Electricity). Electric power systems. Harmonics (Electric waves). (204)
    - TK3401 Insulation and insulating materials (37)
    - TK351 Electric measurements. (26)
    - TK4035.R4 Refrigeration and refrigerating machinery (25)
    - TK4055 Electric motor (47)
    - TK452 Electric apparatus and materials (15)
    - TK4660 Electric welding. (3)
    - TK5101 Telecommunication (239)
    - TK5102.5 Modulation (Electronics), Demodulation (Electronics) (45)
    - TK5102.9 Signal processing. (130)
    - TK5102.94 Cryptographic techniques (14)
    - TK5103.2 Wireless communication systems. Two way wireless communication (166)
    - TK5103.484 Orthogonal frequency division multiplexing. (1)
    - TK5103.8 Switching systems (6)
    - TK5105 Data Transmission Systems (184)
    - TK5105.543 Routers (Computer networks) (14)
    - TK5105.546 Computer algorithms (277)
    - TK5105.585 TCP/IP (Computer network protocol) (75)
    - TK5105.5956 Quality of service. Reliability Including network performance (42)
    - TK5105.888 Web sites--Design. Web site development. (180)
    - TK5105.88815 Semantic Web (5)
    - TK531 Current and voltage waveforms (8)
    - TK6401+ telephone systems and instruments (6)
    - TK6564 Radio transmitter-receivers (37)
    - TK6564.4.C45 Cell phones (2)
    - TK6565.P3 Panels (2)
    - TK6565.T7 Transformers (21)
    - TK6570_iPhone (Smartphone). RFID. Mobile communication systems. (57)
    - TK6592.O6 Optical radar (8)
    - TK6630 Television (2)
    - TK7 Turbogenerators. Steam-turbines (15)
    - TK7867.5 Noise (5)
    - TK7868.P6 Power supply (15)
    - TK7870.23 Reliability. Failures (40)
    - TK7871.58 Audio amplifiers--Design and construction. (6)
    - TK7871.6 Antennas (Electronics) (74)
    - TK7871.674 Detectors. Sensors (155)
    - TK7872 Electric current converters, Electric inverters. (160)
    - TK7872 Electromagnetic Devices (69)
    - TK7872.C8 Current converters (4)
    - TK7872.F5 Filters (Electric) (8)
    - TK7878 Electronic instruments (85)
    - TK7882.B56 Biometric identification (11)
    - TK7882.P3 Pattern recognition systems (47)
    - TK7888.3 Digital computers (24)
    - TK7895.S65 Speech recognition systems (15)
    - TK9956 Radio. Wireless telephone (11)
  - TL Motor vehicles. Aeronautics. Astronautics (90)
    - TL152.5 Motor vehicles Driving (26)
    - TL152.8 Vehicles, Remotely piloted. Autonomous vehicles. (56)
    - TL175 Parking facilities (28)
    - TL210 Automobiles--Lubrication systems. (6)
    - TL214 Automobiles--Motors--Pistons and piston rings. (13)
    - TL214.T87 Automobiles--Motors--Turbochargers (8)
    - TL220 Electric vehicles and their batteries, etc. (90)
    - TL221.5 Hybrid Vehicles. Hybrid cars (24)
    - TL229.D5 Diesel automobiles (10)
    - TL240.5 Composite materials (62)
    - TL257 Springs and suspension (9)
    - TL257.5 Automobiles--Shock absorbers--Design and construction. (53)
    - TL269.C474 Brakes--Maintenance and repair (13)
    - TL270 Automobiles--Wheels--Alignment. (8)
    - TL275.J6 Automobiles--Maintenance and repair. (10)
    - TL410 Bicycles and bicycling--Design and construction (19)
    - TL440 Motorcycles. (12)
    - TL445.M369 Motorcycles--Electric equipment--Maintenance and repair. (5)
    - TL448 Electric motorcycles (31)
    - TL507.G77 Vortex generators. (5)
    - TL521 Aerodynamics, Hypersonic. (40)
    - TL521.3 Automatic Control (204)
    - TL574.C3 Cascade (3)
    - TL589.2.N3 Navigation computer (8)
    - TL671.6. Materials--Fatigue. (19)
    - TL671.9 Airplanes--Maintenance and Repair (11)
    - TL673.F6 Flaps (Airplane) (1)
    - TL681.A5 Air conditioning (Aeronautics ) (7)
    - TL696.C6 Airplanes--Collision avoidance (2)
    - TL697.P6 Pneumatic equipment (5)
    - TL725 Airport terminals. (3)
    - TL725.3 Traffic Control (27)
    - TL725.3.B8 Airport buildings. (2)
    - TL725.3.P5 Airports--Planning. Airports--Design and construction. (3)
    - TL725.3.R8 Runways (5)
    - TL725.3.T7 Air traffic control (4)
    - TL776 .N67 Quadrotor helicopters--Automatic control (8)
    - TL777 Details and parts of models (Including propellers) (6)
    - TL798.N3 Global Positioning System. (10)
  - TN Mining engineering. Metallurgy (37)
    - TN23 Metal cladding. (9)
    - TN24 Aquifers (2)
    - TN269 Prospecting--Geophysical methods (25)
    - TN271.K2 Kaolin (4)
    - TN295 Fly ash (13)
    - TN408.N56 Sand, Iron (5)
    - TN490 Zircon mines and mining (2)
    - TN677 Blast furnaces. (17)
    - TN687 Electric furnaces. (11)
    - TN688 Hydrometallurgy (15)
    - TN689+ Physical metallurgy (8)
    - TN690 Metallography. Physical metallurgy (82)
    - TN693.M3 Magnesium (7)
    - TN752.I5 Steel--Heat treatment (140)
    - TN775 Aluminum alloys--Metallurgy. (15)
    - TN799.N6 Nickel--Metallurgy (23)
    - TN871.3 Offshore well drilling (18)
    - TN879.5 Petroleum pipelines (37)
    - TN879.6 Welding (52)
    - TN880.5 Natural gas pipelines (28)
  - TP Chemical technology (25)
    - TP1140 Polymers (122)
    - TP1151 Special molding and casting processes (4)
    - TP1175.S6 Spraying Coating with plastics (4)
    - TP155.5 Chemical plants--Design and construction (93)
    - TP156 Crystallization. Extraction (Chemistry). Fermentation. Distillation. Emulsions. (220)
    - TP156.C64 Controlled release technology (3)
    - TP159.A5 Antioxidants (2)
    - TP159.M4 Membranes (Technology) (6)
    - TP159.M6 Zeolites (15)
    - TP159.S4 Separators (Machine) (16)
    - TP245.C3 Calcium carbonate. (3)
    - TP248 Nanogels. Nanoparticles. (82)
    - TP248.25.M45 Membrane reactors (4)
    - TP248.25.M46 Membrane separation (25)
    - TP248.25.N35 Microencapsulation. (3)
    - TP248.3 Biochemical engineering. Bioprocess engineering (40)
    - TP248.65.C55 Chitosan--Biotechnology. (5)
    - TP255 Electrochemistry, Industrial. (119)
    - TP339 Ethanol as fuel. Biomass energy. (54)
    - TP343 Liquid and gaseous fuel (59)
    - TP350 Natural gas--Drying. (46)
    - TP359 Biogas (74)
    - TP359.B46 Biodiesel fuels. (25)
    - TP370 Food processing and manufacture (51)
    - TP382 Sugar--Analysis. (5)
    - TP451.E3 Edible coatings. (2)
    - TP492.3 Refrigeration and refrigerating machinery (16)
    - TP669 Oils, fats, and waxes (31)
    - TP692.5 Oil and gasoline handling and storage (35)
    - TP761.L5 Liquefied natural gas (1)
    - TP845+ Glass manufacture (1)
    - TP883 Portland cement. (8)
    - TP884.L5 Lightweight concrete (2)
    - TP894 Bleaching, cleaning, scouring (3)
    - TP994 Surface active agents. (5)
  - TR Photography (22)
    - TR260.7 Autofocus cameras (2)
    - TR267.733.M85 Multispectral imaging (11)
    - TR845 Cinematography. Video recordings. (19)
    - TR897.7 Computer animation (43)
  - TS Manufactures (1)
    - TS1017 Athletic shoes (1)
    - TS155 Production control. Production planning. Production management (142)
    - TS156 Quality Control. QFD. Taguchi methods (Quality control) (298)
    - TS157.5 Production scheduling (31)
    - TS161 Materials management. (3)
    - TS167 Costs, Industrial (150)
    - TS170 New products. Product Development (97)
    - TS171 Product design (247)
    - TS173 Reliability of industrial products (34)
    - TS174 Maintainability (Engineering) . Reliability (Engineering) (75)
    - TS176 Manufacturing engineering. Process engineering (Including manufacturing planning, production planning) (134)
    - TS195 Packaging (14)
    - TS205 Metals--Heat treatment. (23)
    - TS227 Welding. (71)
    - TS2301.T7 Toys, etc (4)
    - TS233 Sand casting. Metal castings--Thermal properties. (12)
    - TS253 Die-Casting (22)
    - TS280 Pipe Bending, Tube Bending (32)
    - TS283 Pressure vessels. (1)
    - TS320 Steel--Metallurgy. (10)
    - TS670 Electroplating (1)
    - TS695 Physical/Chemical vapor deposition (7)
    - TS699 Powder coating of metals (19)
  - TT Handicrafts Arts and crafts (1)
    - TT149 Craft festivals--Planning. (1)
    - TT199.7 Wood-carving. (3)
  - TX Home economics (30)
    - TX349 Nutrition. Foods and food supply (11)
- C Auxiliary Sciences of History (1)
  - C Auxiliary sciences of history (General) (3)
  - 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) (4)
    - D051 Ancient History (9)
    - D111 Medieval History (1)
    - D204 Modern History (4)
    - D731 World War II (3)
    - D839 Post-war History, 1945 on (3)
    - D880 Developing Countries (1)
    - D901 Europe (General) (1)
  - DF Greece (1)
  - DJ Netherlands (Holland) (1)
  - DS Asia (5)
  - DU Oceania (South Seas) (1)
- E History America (1)
  - E151 United States (General) (1)
- G Geography. Anthropology. Recreation (30)
  - G Geography (General) (147)
    - G109.5 Global Positioning System (82)
    - G155 Tourism (133)
    - G70.212 ArcGIS. Geographic information systems. (204)
    - G70.217 Geospatial data (147)
    - G70.5.I4 Remote sensing (182)
  - GA Mathematical geography. Cartography (26)
    - GA102.4.R44 Cartography--Remote sensing (5)
    - GA105.3 Cartography. (11)
    - GA139 Digital Elevation Model (computer program) (26)
  - GB Physical geography (9)
    - GB1003.2 Groundwater. (9)
    - GB1197.7 Groundwater flow. Reservoirs (32)
    - GB1399.9 Floods (22)
    - GB600 Karst conservation. (10)
  - GC Oceanography (5)
    - GC1018.5 Ocean zoning. (5)
    - GC89 Sea Level (5)
  - GE Environmental Sciences (142)
  - GF Human ecology. Anthropogeography (11)
  - GN Anthropology (9)
  - GR Folklore (8)
  - GT Manners and customs (4)
  - GV Recreation Leisure (30)
    - GV1469.15 Mobile games. (8)
    - GV1469.2 Computer games (108)
    - GV423 Playgrounds. (3)
    - GV191.66 Outdoor recreation resources planning and management (30)
- H Social Sciences (19)
  - H Social Sciences (General) (37)
    - H61.4 Forecasting in the social sciences (37)
  - HA Statistics (82)
    - HA29 Theory and method of social science statistics (120)
    - HA30.3 Time-series analysis (106)
    - HA30.6 Spatial analysis (64)
    - HA31.3 Regression. Correlation (215)
    - HA31.35 Analysis of variance (43)
    - HA31.38 Data envelopment analysis. (23)
    - HA31.7 Estimation (82)
  - HB Economic Theory (131)
    - Economic forecasting--Mathematical models. (131)
    - HB615 Entrepreneurship. (12)
    - HB801 Consumer behavior. (92)
    - HB846.2 Cost benefit analysis (43)
  - HC Economic History and Conditions (48)
    - HC108 Market surveys. (48)
    - HC79.E5 Sustainable development. (circular economy) (6)
  - HD Industries. Land use. Labor (19)
    - HD108 Classification (Theory. Method. Relation to other subjects ) (52)
    - HD1387 Valuation (3)
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