Classification
511 - General principles of mathematics
272
006 - Special computer methods
207
515 - Analysis
84
510 - Mathematics
83
004 - Data processing & computer science
76
005 - Computer programming, programs & data
72
512 - Algebra
46
519 - Probabilities & applied mathematics
45
620 - Engineering & allied operations
45
658 - General management
34
160 - Logic
31
514 - Topology
31
330 - Economics
23
500 - Natural sciences & mathematics
20
621 - Applied physics
20
000 - Computer science, information & general works
18
501 - Philosophy & theory
17
600 - Technology
17
700 - The arts; fine & decorative arts
15
003 - Systems
13
670 - Manufacturing
12
100 - Philosophy & psychology
11
410 - Linguistics
10
300 - Social sciences
9
380 - Commerce, communications & transportation
9
530 - Physics
9
001 - Knowledge
7
900 - History & geography
7
333 - Economics of land & energy
6
363 - Other social problems & services
6
516 - Geometry
6
541 - Physical chemistry
6
616 - Diseases
6
629 - Other branches of engineering
5
650 - Management & auxiliary services
5
025 - Library operations
4
400 - Language
4
518 - Numerical analysis
4
570 - Life sciences; biology
4
610 - Medicine & health
4
140 - Specific philosophical schools
3
150 - Psychology
3
301 - Sociology & anthropology
3
370 - Education
3
371 - Schools & their activities; special education
3
576 - Genetics & evolution
3
745 - Decorative arts
3
111 - Ontology
2
121 - Epistemology
2
200 - Religion
2
more ...