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Library of Congress Subject Areas (24329)
- A General Works (72)
  - AC Collections. Series. Collected works (15)
  - AI Indexes (General) (16)
  - AM Museums (General). Collectors and collecting (General) (22)
  - AS Academies and learned societies (General) (22)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (53)
  - B Philosophy (General) (7)
  - BC Logic (1)
  - BF Psychology (33)
  - BH Aesthetics (6)
  - BJ Ethics (4)
  - BL Religion (2)
  - BP Islam. Bahaism. Theosophy, etc (7)
  - BV Practical Theology (2)
    - BV1460 Religious Education (2)
- T Technology (14771)
  - T Technology (General) (3101)
    - T11 Technical writing. Scientific Writing (17)
    - T174 Technological forecasting (102)
    - T174.5 Technology--Risk assessment. (142)
    - T201 Patents. Trademarks (11)
    - T385 Visualization--Technique (38)
    - T55 Industrial Safety (190)
    - T56.8 Project Management (412)
    - T57.5 Data Processing (342)
    - T57.6 Operations research--Mathematics. Goal programming (62)
    - T57.62 Simulation (250)
    - T57.74 Linear programming (19)
    - T57.8 Nonlinear programming. Support vector machine. Wavelets. Hidden Markov models. (46)
    - T57.83 Dynamic programming (32)
    - T57.84 Heuristic algorithms. (40)
    - T58.5 Information technology. IT--Auditing (196)
    - T58.6 Management information systems (381)
    - T58.62 Decision support systems (328)
    - T58.8 Productivity. Efficiency (108)
    - TA404 Materials--Biodegradation (13)
  - TA Engineering (General). Civil engineering (General) (2705)
    - TA1800 Fiber Optics (16)
    - TA357.5.S57 Sloshing (2)
    - TA1573 Detectors. Sensors (35)
    - TA158.7 Computer network resources (23)
    - TA1637 Image processing--Digital techniques (345)
    - TA1650 Face recognition. Optical pattern recognition. (22)
    - TA167.5 Neurotechnology. Neuroadaptive systems (6)
    - TA169 Reliability (Engineering) (57)
    - TA169.5 Failure analysis (37)
    - TA174 Computer-aided design. (42)
    - TA1815 Optical fiber detectors. Bragg gratings. (2)
    - TA347 Finite Element Method (210)
    - TA355 Vibration. (20)
    - TA357 Computational fluid dynamics. Fluid Mechanics (74)
    - TA417.3 Magnetic testing. (1)
    - TA418.16 Materials--Testing. (22)
    - TA418.38 Materials--Fatigue. (34)
    - TA418.42 Hardness properties and tests. Hardness--Testing. (16)
    - TA418.74 Corrosion and anti-corrosives (154)
    - TA418.75 Corrosion-resistant materials (22)
    - TA418.9 Composite materials. Laminated materials. (210)
    - TA418.9.C57 Coatings (11)
    - TA439 Lightweight concrete. High strength concrete. (7)
    - TA440 Concrete--Cracking. (51)
    - TA441 Aggregates (27)
    - TA443.A7 Asphalt (31)
    - TA444 Reinforced concrete (50)
    - TA455 Carbon. Nanotubes. (20)
    - TA455.A34 Adhesives (5)
    - TA455.G65 Graphene (1)
    - TA455.S6 Soil (Materials of engineering and construction) (70)
    - TA460 Metals--Fatigue. (13)
    - TA462 Metal Corrosion and protection against corrosion (17)
    - TA467 Iron and Steel Corrosion and protection against corrosion (18)
    - TA480.A6 Aluminum alloys. (1)
    - TA491 Metal coating. (32)
    - TA492.G5 Girders (7)
    - TA492.W4 Welded joints (21)
    - TA590 Topographical surveying (17)
    - TA593.35 Instruments, cameras, etc. (13)
    - TA645 Structural analysis (Engineering) (448)
    - TA656.2 Buckling (7)
    - TA658 Structural design (119)
    - TA660.C6 Columns (15)
    - TA660.F7 Structural frames. (10)
    - TA660.P55 Underground pipeline design, construction and management (13)
    - TA660.T34 Tanks. Pressure vessels (9)
    - TA681 Concrete construction (229)
    - TA683 Precast concrete construction. Prestressed concrete construction. (142)
    - TA749 Soil stabilization (126)
    - TA760+ Retaining walls (25)
    - TA775 Foundations. (66)
    - TA780 Piles and pile-driving (25)
    - TA780.C29 Piling (Civil engineering) (13)
  - TC Hydraulic engineering. Ocean engineering (1007)
    - TC147 Ocean wave power. (97)
    - TC1665 Offshore structures--Materials. (51)
    - TC167 Dams, reservoirs (46)
    - TC1680 Offshore structures (345)
    - TC173 Orifices. Nozzles. Jets (2)
    - TC175.2 Sediment transport (26)
    - TC203.5 Coastal engineering (38)
    - TC205 Harbors--Design and construction. (62)
    - TC333 Breakwaters (19)
    - TC343+ Reclamation of land from the sea (2)
    - TC357 Harbor Engineering. Piers, quays, and wharves (58)
    - TC363 Floating harbors. Including floating docks, piers, etc (13)
    - TC424 Water levels (40)
    - TC530 Flood control (27)
    - TC555 Spillways. Energy dissipation. Hydraulic jump. (24)
    - TC801 Reclamation of land (5)
    - TC812 Irrigation (70)
  - TD Environmental technology. Sanitary engineering (1064)
    - TD171.75 Climate change mitigation (31)
    - TD192.5 Bioremediation (23)
    - TD194.6 Environmental impact analysis (50)
    - TD195.B56 Biomass energy (33)
    - TD195.S47 Sewage disposal plants--Environmental aspects (2)
    - TD233 Water consumption (28)
    - TD259.2 Drinking water. Water quality (69)
    - TD375 Turbidity--Measurement. (14)
    - TD395 Reservoirs (water supply) (31)
    - TD418 Water harvesting (12)
    - TD420 Water pollution (58)
    - TD427.F58 Fly ash (6)
    - TD430 Water--Purification. (55)
    - TD433 Water treatment plants (66)
    - TD455 Chemical precipitation. Coagulation. Flocculation. Water--Purification--Flocculation. (21)
    - TD479.3 Saline water conversion (9)
    - TD480.5 Electrodialysis (4)
    - TD481 Water distribution systems (38)
    - TD491 Spillways (12)
    - TD646 Sewage--Purification (166)
    - TD756.45 Anaerobic treatment (9)
    - TD767.7 Sewage sludge treatment and disposal (43)
    - TD789 Refuse and refuse disposal (76)
    - TD795.7 Sanitary landfills. Leachate--Purification. (11)
    - TD796 Incineration. Incinerators (4)
    - TD796.5 Composting (4)
    - TD799.85 Electronic apparatus and appliances waste (3)
    - TD878.47 Soil remediation (13)
    - TD883 Air quality management. (13)
    - TD883.2 Automobiles--Motors--Exhaust gas (5)
    - TD883.5 Air--Pollution (140)
    - TD887.B58 Air pollutants. Bituminous materials (8)
    - TD890 Global Environmental Monitoring System (21)
    - TD892 Noise control (30)
    - TD898.8.C67 Waste disposal (30)
    - TD899 Waste control in special industries, plants, processes, etc (20)
    - TD899.S68 Steam power plants (17)
  - TE Highway engineering. Roads and pavements (652)
    - TE175 Road and highway design (109)
    - TE215 Drainage (58)
    - TE228.3 Intelligent transportation systems. (11)
    - TE228.37 Vehicular ad hoc networks (Computer networks) (11)
    - TE251.T74 Pavements--Design and construction (11)
    - TE278.D523 Pavements, Concrete--Testing. (1)
    - TE7 TG300 Bridges--Design and construction. (16)
    - TE7 Transportation--Planning (335)
    - TE7.H5 Airports--Planning. Airport terminals--Planning (32)
  - TF Railroad engineering and operation (124)
    - TF1327.O58 High speed ground transportation (train) (11)
    - TF193 Estimates, costs, etc. (35)
    - TF240 Railway construction (8)
    - TF270 Railway structures and buildings (25)
    - TF4 Railroads--Automation. (1)
    - TF652 Station management (6)
    - TF872 Rails (Track) (6)
  - TG Bridge engineering (131)
    - TG362 Box girder bridges--Design and construction. (13)
  - TH Building construction (694)
    - TH1095 Earthquakes and building (62)
    - TH11 Builders' and contractors' bulletins. Including prices, permits, etc. (7)
    - TH1461 Concrete construction. (49)
    - TH2247 Shear walls--Materials (5)
    - TH2486 Skylights and ventilators (5)
    - TH2521 Floors and flooring (4)
    - TH3000 Basements--Remodeling. (12)
    - TH3351 Maintenance and repair (27)
    - TH385 Building layout. (17)
    - TH437 Building--Cost control. (134)
    - TH438 Construction industry--Management. Project management. (148)
    - TH438.13 Building information modeling. (13)
    - TH4811 House construction (10)
    - TH4860 Ecological houses--Design and construction. (3)
    - TH6515 Plumbing. (4)
    - TH6840 Piping installation. Pipefitting (11)
    - TH6882 Flame monitors Ignition devices Including electric ignitors (2)
    - TH7687.7 Cooling Systems and details (10)
    - TH7703 Illumination. Lighting (11)
    - TH880 Sustainable buildings. Sustainable construction. Green building (34)
    - TH900+ Construction equipment in building construction (11)
    - TH9737 Electronic security systems (1)
    - TH9745.D85 Dwellings (6)
  - TJ Mechanical engineering and machinery (2421)
    - TJ1058 Rotors (8)
    - TJ1077 Lubrication and lubricants. (11)
    - TJ1185 Metal-cutting--Problems, exercises, etc. (5)
    - TJ1186 Metal-cutting tools. (14)
    - TJ1186.B5 Metal-cutting tools--Design and construction. (9)
    - TJ1225 Milling machines numerically controlled (6)
    - TJ1230 Cutting and sawing machinery (20)
    - TJ1363 Cranes, derricks, etc. (9)
    - TJ1398 Conveyors (28)
    - TJ164 Power plants--Design and construction (179)
    - TJ165 Energy storage. (30)
    - TJ174 Maintenance and repair of machinery (68)
    - TJ211 Robotics. (74)
    - TJ211.4 Robot motion (18)
    - TJ211.415 Mobile robots (30)
    - TJ213 Automatic control. (148)
    - TJ217 Adaptive control systems (11)
    - TJ217.2 Robust control (12)
    - TJ217.6 Predictive Control (83)
    - TJ219 Pneumatic control systems (22)
    - TJ222 Supervisory control systems. (16)
    - TJ223 PID controllers (226)
    - TJ223.P76 Programmable controllers (36)
    - TJ230 Machine design (336)
    - TJ254.7 Combustion chambers (19)
    - TJ263 Heat exchangers (138)
    - TJ263.5 Boilers (general) (30)
    - TJ265.E23 Thermodynamics. (11)
    - TJ266 Turbines. Turbomachines (General) (49)
    - TJ324.5 Fuel systems (40)
    - TJ357 Pressure regulators (3)
    - TJ541 Flywheels. (2)
    - TJ561 Surface (9)
    - TJ669.B7 Locomotive brakes (6)
    - TJ700 Traction engines, etc. (5)
    - TJ762.E93 Exhaust systems (4)
    - TJ778 Gas turbines (32)
    - TJ785 Internal combustion engines. Spark ignition (55)
    - TJ799 Diesel motor--Electronic control. (118)
    - TJ808 Renewable energy sources. Energy harvesting. (74)
    - TJ810.5 Solar energy (54)
    - TJ820 Wind power (24)
    - TJ828 Wind turbines (105)
    - TJ840.A2+ hydraulic machinery (1)
    - TJ870 Hydraulic turbines. (6)
    - TJ903 Pumping machinery. (40)
    - TJ910 Electric pumping machinery (13)
    - TJ919 Centrifugal pumps--Design and construction. (27)
    - TJ930 Pipelines (General). Underwater pipelines. (29)
    - TJ935 Pipe--Fluid dynamics. Tubes--Fluid dynamics (116)
    - TJ950 Pneumatic machinery (13)
    - TJ990 Compressors (24)
  - TK Electrical engineering. Electronics Nuclear engineering (2868)
    - TK1001 Production of electric energy or power (114)
    - TK1007 Electric power systems control (61)
    - TK1010 Electric power system stability. Electric filters, Passive. (120)
    - TK105.8883 Web authoring software (include web server) (19)
    - TK1056 Solar powerplants (26)
    - TK1073 Ocean thermal energy conversion (9)
    - TK1087 Photovoltaic power generation (103)
    - TK1318 Geothermal Power Plants (33)
    - TK1322.6 Electric power-plants (109)
    - TK1519.S68 Hydroelectric power plants (11)
    - TK153 Electric power factor. (2)
    - TK201 Electric Power Transmission (292)
    - TK2211 Eddy currents (Electric) (1)
    - TK2551 Electric transformers. (12)
    - TK2681.B47 Electric motors, Direct current. (15)
    - TK2681.O85 Electric motors, Brushless. (15)
    - TK2692 Inverters (8)
    - TK2785 Electric motors, Induction. (90)
    - TK2791 D.C. to A.C. transforming machinery. (6)
    - TK2797 Motor-generator sets. Cascade (19)
    - TK2851 Voltage regulators. (9)
    - TK2861 Electric relays (84)
    - TK2921 Lithium cells. (26)
    - TK2931 Fuel cells (19)
    - TK2941 Storage batteries (17)
    - TK2945 Lead-acid batteries. (20)
    - TK2950 Thermoelectric materials. (2)
    - TK2960 Dye-sensitized solar cells. Solar batteries. Solar cells (41)
    - TK3030 Electric power distribution systems (46)
    - TK3070 Automatic control (94)
    - TK3226 Transients (Electricity). Electric power systems. Harmonics (Electric waves). (183)
    - TK3401 Insulation and insulating materials (29)
    - TK351 Electric measurements. (18)
    - TK4035.R4 Refrigeration and refrigerating machinery (24)
    - TK4055 Electric motor (37)
    - TK452 Electric apparatus and materials (12)
    - TK4660 Electric welding. (2)
    - TK5101 Telecommunication (218)
    - TK5102.5 Modulation (Electronics), Demodulation (Electronics) (40)
    - TK5102.9 Signal processing. (96)
    - TK5102.94 Cryptographic techniques (11)
    - TK5103.2 Wireless communication systems. Two way wireless communication (144)
    - TK5103.484 Orthogonal frequency division multiplexing. (1)
    - TK5103.8 Switching systems (2)
    - TK5105 Data Transmission Systems (181)
    - TK5105.543 Routers (Computer networks) (9)
    - TK5105.546 Computer algorithms (258)
    - TK5105.585 TCP/IP (Computer network protocol) (62)
    - TK5105.5956 Quality of service. Reliability Including network performance (34)
    - TK5105.888 Web sites--Design. Web site development. (133)
    - TK5105.88815 Semantic Web (5)
    - TK531 Current and voltage waveforms (6)
    - TK6401+ telephone systems and instruments (5)
    - TK6564 Radio transmitter-receivers (29)
    - TK6564.4.C45 Cell phones (2)
    - TK6565.P3 Panels (2)
    - TK6565.T7 Transformers (15)
    - TK6570_iPhone (Smartphone). RFID. Mobile communication systems. (53)
    - TK6592.O6 Optical radar (7)
    - TK6630 Television (2)
    - TK7 Turbogenerators. Steam-turbines (9)
    - TK7867.5 Noise (3)
    - TK7868.P6 Power supply (13)
    - TK7870.23 Reliability. Failures (35)
    - TK7871.58 Audio amplifiers--Design and construction. (4)
    - TK7871.6 Antennas (Electronics) (65)
    - TK7871.674 Detectors. Sensors (120)
    - TK7872 Electric current converters, Electric inverters. (152)
    - TK7872 Electromagnetic Devices (65)
    - TK7872.C8 Current converters (3)
    - TK7872.F5 Filters (Electric) (2)
    - TK7878 Electronic instruments (57)
    - TK7882.B56 Biometric identification (10)
    - TK7882.P3 Pattern recognition systems (40)
    - TK7888.3 Digital computers (16)
    - TK7895.S65 Speech recognition systems (14)
    - TK9956 Radio. Wireless telephone (11)
  - TL Motor vehicles. Aeronautics. Astronautics (686)
    - TL152.5 Motor vehicles Driving (18)
    - TL152.8 Vehicles, Remotely piloted. Autonomous vehicles. (41)
    - TL175 Parking facilities (22)
    - TL210 Automobiles--Lubrication systems. (5)
    - TL214 Automobiles--Motors--Pistons and piston rings. (12)
    - TL214.T87 Automobiles--Motors--Turbochargers (7)
    - TL220 Electric vehicles and their batteries, etc. (62)
    - TL221.5 Hybrid Vehicles. Hybrid cars (16)
    - TL229.D5 Diesel automobiles (9)
    - TL240.5 Composite materials (51)
    - TL257 Springs and suspension (8)
    - TL257.5 Automobiles--Shock absorbers--Design and construction. (45)
    - TL269.C474 Brakes--Maintenance and repair (7)
    - TL270 Automobiles--Wheels--Alignment. (5)
    - TL275.J6 Automobiles--Maintenance and repair. (8)
    - TL410 Bicycles and bicycling--Design and construction (13)
    - TL440 Motorcycles. (10)
    - TL445.M369 Motorcycles--Electric equipment--Maintenance and repair. (4)
    - TL448 Electric motorcycles (20)
    - TL507.G77 Vortex generators. (2)
    - TL521 Aerodynamics, Hypersonic. (32)
    - TL521.3 Automatic Control (187)
    - TL574.C3 Cascade (2)
    - TL589.2.N3 Navigation computer (6)
    - TL671.6. Materials--Fatigue. (14)
    - TL671.9 Airplanes--Maintenance and Repair (9)
    - TL673.F6 Flaps (Airplane) (1)
    - TL681.A5 Air conditioning (Aeronautics ) (7)
    - TL696.C6 Airplanes--Collision avoidance (1)
    - TL697.P6 Pneumatic equipment (3)
    - TL725 Airport terminals. (2)
    - TL725.3 Traffic Control (23)
    - TL725.3.B8 Airport buildings. (1)
    - TL725.3.P5 Airports--Planning. Airports--Design and construction. (2)
    - TL725.3.R8 Runways (5)
    - TL725.3.T7 Air traffic control (2)
    - TL776 .N67 Quadrotor helicopters--Automatic control (4)
    - TL777 Details and parts of models (Including propellers) (5)
    - TL798.N3 Global Positioning System. (5)
  - TN Mining engineering. Metallurgy (494)
    - TN23 Metal cladding. (8)
    - TN24 Aquifers (2)
    - TN269 Prospecting--Geophysical methods (19)
    - TN271.K2 Kaolin (3)
    - TN295 Fly ash (9)
    - TN408.N56 Sand, Iron (5)
    - TN490 Zircon mines and mining (1)
    - TN677 Blast furnaces. (17)
    - TN687 Electric furnaces. (8)
    - TN688 Hydrometallurgy (13)
    - TN689+ Physical metallurgy (7)
    - TN690 Metallography. Physical metallurgy (73)
    - TN693.M3 Magnesium (6)
    - TN752.I5 Steel--Heat treatment (134)
    - TN775 Aluminum alloys--Metallurgy. (10)
    - TN799.N6 Nickel--Metallurgy (19)
    - TN871.3 Offshore well drilling (15)
    - TN879.5 Petroleum pipelines (35)
    - TN879.6 Welding (48)
    - TN880.5 Natural gas pipelines (23)
  - TP Chemical technology (1028)
    - TP1140 Polymers (103)
    - TP1151 Special molding and casting processes (4)
    - TP1175.S6 Spraying Coating with plastics (3)
    - TP155.5 Chemical plants--Design and construction (82)
    - TP156 Crystallization. Extraction (Chemistry). Fermentation. Distillation. Emulsions. (209)
    - TP156.C64 Controlled release technology (3)
    - TP159.A5 Antioxidants (1)
    - TP159.M4 Membranes (Technology) (6)
    - TP159.M6 Zeolites (14)
    - TP159.S4 Separators (Machine) (13)
    - TP245.C3 Calcium carbonate. (2)
    - TP248 Nanogels. Nanoparticles. (72)
    - TP248.25.M45 Membrane reactors (4)
    - TP248.25.M46 Membrane separation (23)
    - TP248.25.N35 Microencapsulation. (2)
    - TP248.3 Biochemical engineering. Bioprocess engineering (32)
    - TP248.65.C55 Chitosan--Biotechnology. (5)
    - TP255 Electrochemistry, Industrial. (105)
    - TP339 Ethanol as fuel. Biomass energy. (46)
    - TP343 Liquid and gaseous fuel (52)
    - TP350 Natural gas--Drying. (43)
    - TP359 Biogas (72)
    - TP359.B46 Biodiesel fuels. (11)
    - TP370 Food processing and manufacture (40)
    - TP382 Sugar--Analysis. (5)
    - TP451.E3 Edible coatings. (2)
    - TP492.3 Refrigeration and refrigerating machinery (12)
    - TP669 Oils, fats, and waxes (23)
    - TP692.5 Oil and gasoline handling and storage (31)
    - TP845+ Glass manufacture (1)
    - TP883 Portland cement. (6)
    - TP884.L5 Lightweight concrete (2)
    - TP894 Bleaching, cleaning, scouring (3)
    - TP994 Surface active agents. (3)
  - TR Photography (70)
    - TR260.7 Autofocus cameras (2)
    - TR267.733.M85 Multispectral imaging (8)
    - TR845 Cinematography. Video recordings. (16)
    - TR897.7 Computer animation (32)
  - TS Manufactures (1064)
    - TS155 Production control. Production planning. Production management (116)
    - TS156 Quality Control. QFD. Taguchi methods (Quality control) (268)
    - TS157.5 Production scheduling (28)
    - TS167 Costs, Industrial (133)
    - TS170 New products. Product Development (65)
    - TS171 Product design (175)
    - TS173 Reliability of industrial products (28)
    - TS174 Maintainability (Engineering) . Reliability (Engineering) (58)
    - TS176 Manufacturing engineering. Process engineering (Including manufacturing planning, production planning) (102)
    - TS195 Packaging (8)
    - TS205 Metals--Heat treatment. (13)
    - TS227 Welding. (47)
    - TS2301.T7 Toys, etc (3)
    - TS233 Sand casting. Metal castings--Thermal properties. (10)
    - TS253 Die-Casting (20)
    - TS280 Pipe Bending, Tube Bending (28)
    - TS320 Steel--Metallurgy. (3)
    - TS670 Electroplating (1)
    - TS695 Physical/Chemical vapor deposition (7)
    - TS699 Powder coating of metals (17)
  - TT Handicrafts Arts and crafts (34)
    - TT199.7 Wood-carving. (3)
  - TX Home economics (37)
    - TX349 Nutrition. Foods and food supply (10)
- C Auxiliary Sciences of History (14)
  - C Auxiliary sciences of history (General) (2)
  - CB History of civilization (3)
  - CC Archaeology (8)
  - CE Technical chronology. Calendar (2)
- D History General and Old World (28)
  - D History (General) (23)
    - D051 Ancient History (9)
    - D204 Modern History (2)
    - D731 World War II (2)
    - D839 Post-war History, 1945 on (2)
    - D880 Developing Countries (1)
    - D901 Europe (General) (1)
  - DF Greece (1)
  - DJ Netherlands (Holland) (1)
  - DS Asia (3)
  - DU Oceania (South Seas) (1)
- E History America (1)
  - E151 United States (General) (1)
- G Geography. Anthropology. Recreation (963)
  - G Geography (General) (539)
    - G109.5 Global Positioning System (79)
    - G155 Tourism (122)
    - G70.212 ArcGIS. Geographic information systems. (189)
    - G70.217 Geospatial data (141)
    - G70.5.I4 Remote sensing (169)
  - GA Mathematical geography. Cartography (68)
    - GA102.4.R44 Cartography--Remote sensing (3)
    - GA105.3 Cartography. (9)
    - GA139 Digital Elevation Model (computer program) (24)
  - GB Physical geography (112)
    - GB1003.2 Groundwater. (7)
    - GB1197.7 Groundwater flow. Reservoirs (30)
    - GB1399.9 Floods (21)
    - GB600 Karst conservation. (9)
  - GC Oceanography (94)
    - GC1018.5 Ocean zoning. (3)
    - GC89 Sea Level (3)
  - GE Environmental Sciences (127)
  - GF Human ecology. Anthropogeography (11)
  - GN Anthropology (6)
  - GR Folklore (5)
  - GT Manners and customs (4)
  - GV Recreation Leisure (149)
    - GV1469.15 Mobile games. (4)
    - GV1469.2 Computer games (96)
    - GV423 Playgrounds. (3)
    - GV191.66 Outdoor recreation resources planning and management (28)
- H Social Sciences (3388)
  - H Social Sciences (General) (139)
    - H61.4 Forecasting in the social sciences (27)
  - HA Statistics (833)
    - HA29 Theory and method of social science statistics (80)
    - HA30.3 Time-series analysis (84)
    - HA30.6 Spatial analysis (46)
    - HA31.3 Regression. Correlation (164)
    - HA31.35 Analysis of variance (30)
    - HA31.38 Data envelopment analysis. (11)
    - HA31.7 Estimation (54)
  - HB Economic Theory (240)
    - Economic forecasting--Mathematical models. (114)
    - HB615 Entrepreneurship. (6)
    - HB801 Consumer behavior. (61)
    - HB846.2 Cost benefit analysis (30)
  - HC Economic History and Conditions (54)
    - HC108 Market surveys. (35)
  - HD Industries. Land use. Labor (1463)
    - HD108 Classification (Theory. Method. Relation to other subjects ) (43)
    - HD1387 Valuation (2)
    - HD1391 Apartment houses (78)
    - HD1393.25 Business enterprises (29)
    - HD28 Management. Industrial Management (214)
    - HD30.2 Knowledge management. (20)
    - HD30.213 Management information systems. Dashboards. Enterprise resource planning. (102)
    - HD30.23 Decision making. Business requirements analysis. (118)
    - HD30.24 Feasibility studies. Feasibility appraisals (26)
    - HD30.28 Planning. Business planning. Strategic planning. (153)
    - HD30.335 Communication systems (17)
    - HD31 Management--Evaluation (107)
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