004 Data Processing; Computer Science
004.21 Systems analysis and design
004.22 Computer architecture
004.5 Storage
004.6 Interfacing and communications
004.65 Computer networks
004.7 Peripherals
005 Computer programming, programs, data
005.1 Programming
005.131 Symbolic logic
005.133 Specific programming languages
005.4 Systems programming
005.43 Operating systems
005.71 Data communications
005.73 Data structures
005.74 Data files and databases
005.8 Data security
006 Special computer methods
006.3 Artif.. intelligence [also 001.535]
006.4 Pattern recognition
006.5 Computer sound synthesis
006.6 Computer graphics
384 Communications/Telecommunication
384.3 Computer communication
384.51 Wireless communication
510 Mathematics
511 General principles of mathematics
512 Algebra
513 Arithmetic
514 Topology
515 Analysis (515.15 Calculus and analytic geometry)
516 Geometry
518 Numerical analysis
519 Probabilities and applied mathematics
520 Astronomy & allied sciences
521 Celestial mechanics
522 Techniques, equipment, materials
523 Specific celestial bodies & phenomena
524 Not assigned or no longer used
525 Earth (Astronomical geography)
526 Mathematical geography
527 Celestial navigation
528 Ephemerides
529 Chronology
530 Physics
531 Classical mechanics; Solid mechanics
532 Fluid mechanics; Liquid mechanics
533 Gas mechanics
534 Sound & related vibrations
535 Light & paraphotic phenomena
536 Heat
537 Electricity & electronics
538 Magnetism
539 Modern physics
551 Geology, hydrology, meteorology
551.01 Philosophy and theory of geology
551.09 History, geographic treatment, biography of geology
551.1 Gross structure and properties of the earth
551.2 Volcanoes, earthquakes, thermal waters and gases
551.3 Surface and exogenous processes and their agents
551.4 Geomorphology and hydrosphere
551.5 Meteorology
551.6 Climatology and weather
551.7 Historical geology
551.8 Structural geology
551.9 Geochemistry
620 Engineering and allied operations
620.1 Mechanics and materials
620.11 Materials science
620.106 Applied fluid mechanics
620.2 Sound and related vibrations
620.3 Mechanical vibration
620.8 Human-factors/safety engineering
621 Applied physics
621.04 Energy and plasma engineering
621.1 Steam engineering
621.2 Hydraulic-power technology
621.3 Electronics, magnetics, communications, computer engineering, lighting
621.39 Computer engineering
621.8 Machine engineering
622 Mining and related operations
622.1 Prospecting /exploratory ops.
622.2 Excavation techniques
622.4 Mine environment
622.5 Mine drainage
622.6 Mine transport systems
622.7 Ore dressing
622.8 Mine health and safety
623 Military and nautical engineering
623.1 Fortifications
623.2 Mine laying, demolition
623.3 Engineering of defens
623.4 Ordnance
623.5 Ballistics and gunnery
623.6 Military transportation technology
623.7 Commun., vehicles, sanitation
623.8 Nautical engineering
624 Civil engineering
624.1 Structural engineering
624.151 Engineering geology
624.2 Bridges
624.3 Specific types of bridges
624.4 Tubular and box-girder bridges
624.5 Suspension bridges
624.6 Arch bridges
624.7 Compound bridges
624.8 Movable bridges
625 Engineering of railroads, roads, highways
625.1 Railroads
625.2 Railroad rolling stock
625.3 Inclined, mountain, ship railroads
625.4 Rapid transit systems
625.5 Cable and aerial railways
625.6 Surface rail and trolley systems
625.7 Roads
625.8 Artificial road surfaces
627 Hydraulic engineering
627.1 Inland waterways
627.2 Harbors, ports, roadsteads
627.3 Port installations
627.4 Flood control
627.5 Reclamation, irrigation
627.7 Underwater operations
627.8 Dams and reservoirs
627.9 Other hydraulic structures
628 Sanitary and municipal engineering
628.1 Water supply
628.2 Sewers and sewage
628.3 Sewage treatment and disposal
628.4 Waste technology
628.5 Industrial sanitation engineering
628.7 Rural sanitary engineering
629 Other branches of engineering
629.04 Transportation engineering
629.1 Aerospace engineering
629.2 Motor land vehicles and cycles
(Automotive engineering)
629.4 Astronautics
629.8 Automatic control engineering
