Classification
001 - Knowledge
8
003 - Systems
3
004 - Data processing & computer science
4
005 - Computer programming, programs & data
2
006 - Special computer methods
5
040 - [Unassigned]
2
300 - Social sciences
9
304 - Factors affecting social behavior
1
330 - Economics
1
333 - Economics of land & energy
6
338 - Production
2
363 - Other social problems & services
4
384 - Communications; telecommunication
2
500 - Natural sciences & mathematics
18
515 - Analysis
3
519 - Probabilities & applied mathematics
13
520 - Astronomy & allied sciences
19
523 - Specific celestial bodies & phenomena
2
526 - Mathematical geography
3
530 - Physics
12
531 - Classical mechanics; solid mechanics
1
536 - Heat
1
541 - Physical chemistry
1
546 - Inorganic chemistry
1
549 - Mineralogy
6
550 - Earth sciences
15
551 - Geology, hydrology & meteorology
13
552 - Petrology
1
553 - Economic geology
1
570 - Life sciences; biology
11
577 - Ecology
1
590 - Animals (Zoology)
1
600 - Technology
1
620 - Engineering & allied operations
24
621 - Applied physics
74
622 - Mining & related operations
1
624 - Civil engineering
47
627 - Hydraulic engineering
2
629 - Other branches of engineering
3
630 - Agriculture & related technologies
2
631 - Techniques, equipment & materials
2
650 - Management & auxiliary services
1
658 - General management
4
660 - Chemical engineering
1
670 - Manufacturing
1
910 - Geography & travel
3
930 - History of ancient world to ca. 499
1