Classification
511 - General principles of mathematics
201
006 - Special computer methods
42
515 - Analysis
35
519 - Probabilities & applied mathematics
30
005 - Computer programming, programs & data
26
512 - Algebra
23
621 - Applied physics
23
004 - Data processing & computer science
21
510 - Mathematics
17
530 - Physics
16
620 - Engineering & allied operations
15
000 - Computer science, information & general works
13
700 - The arts; fine & decorative arts
12
003 - Systems
11
333 - Economics of land & energy
11
500 - Natural sciences & mathematics
11
300 - Social sciences
10
600 - Technology
10
658 - General management
10
330 - Economics
9
363 - Other social problems & services
9
610 - Medicine & health
9
629 - Other branches of engineering
9
900 - History & geography
8
514 - Topology
6
745 - Decorative arts
6
140 - Specific philosophical schools
5
331 - Labor economics
5
516 - Geometry
5
535 - Light & infrared & ultraviolet phenomena
5
100 - Philosophy & psychology
3
380 - Commerce, communications & transportation
3
400 - Language
3
410 - Linguistics
3
576 - Genetics & evolution
3
580 - Plants (Botany)
3
001 - Knowledge
2
301 - Sociology & anthropology
2
302 - Social interaction
2
304 - Factors affecting social behavior
2
307 - Communities
2
320 - Political science
2
540 - Chemistry & allied sciences
2
541 - Physical chemistry
2
570 - Life sciences; biology
2
571 - Physiology & related subjects
2
800 - Literature & rhetoric
2
025 - Library operations
1
160 - Logic
1
170 - Ethics
1
more ...