Classification
001 - Knowledge
10
003 - Systems
43
004 - Data processing & computer science
318
005 - Computer programming, programs & data
267
006 - Special computer methods
1,058
025 - Library operations
8
040 - [Unassigned]
1
100 - Philosophy & psychology
2
128 - Humankind
1
150 - Psychology
1
153 - Mental processes & intelligence
1
300 - Social sciences
1
301 - Sociology & anthropology
1
302 - Social interaction
1
330 - Economics
2
331 - Labor economics
1
333 - Economics of land & energy
5
343 - Military, tax, trade & industrial law
1
363 - Other social problems & services
1
371 - Schools & their activities; special education
4
374 - Adult education
2
381 - Commerce
1
500 - Natural sciences & mathematics
1
501 - Philosophy & theory
1
510 - Mathematics
3
511 - General principles of mathematics
1
512 - Algebra
1
514 - Topology
1
515 - Analysis
4
516 - Geometry
7
518 - Numerical analysis
9
519 - Probabilities & applied mathematics
19
520 - Astronomy & allied sciences
2
530 - Physics
6
543 - Analytical chemistry
1
550 - Earth sciences
1
551 - Geology, hydrology & meteorology
1
560 - Paleontology; paleozoology
1
570 - Life sciences; biology
11
571 - Physiology & related subjects
1
576 - Genetics & evolution
1
601 - Philosophy & theory
1
610 - Medicine & health
53
612 - Human physiology
4
616 - Diseases
9
617 - Surgery & related medical specialties
2
620 - Engineering & allied operations
17
621 - Applied physics
154
624 - Civil engineering
1
629 - Other branches of engineering
29
more ...