Classification
006 - Special computer methods
123
658 - General management
73
005 - Computer programming, programs & data
54
616 - Diseases
36
621 - Applied physics
36
004 - Data processing & computer science
35
620 - Engineering & allied operations
34
003 - Systems
32
304 - Factors affecting social behavior
32
320 - Political science
29
338 - Production
21
617 - Surgery & related medical specialties
21
530 - Physics
19
306 - Culture & institutions
17
363 - Other social problems & services
17
327 - International relations
16
370 - Education
16
519 - Probabilities & applied mathematics
15
551 - Geology, hydrology & meteorology
14
610 - Medicine & health
13
629 - Other branches of engineering
13
330 - Economics
11
332 - Financial economics
11
333 - Economics of land & energy
11
040 - [Unassigned]
10
302 - Social interaction
10
660 - Chemical engineering
10
809 - History, description & criticism
10
910 - Geography & travel
10
579 - Microorganisms, fungi & algae
9
062 - Organizations in British Isles; in England
8
150 - Psychology
8
305 - Social groups
8
512 - Algebra
8
515 - Analysis
8
624 - Civil engineering
8
628 - Sanitary & municipal engineering
8
301 - Sociology & anthropology
7
340 - Law
7
371 - Schools & their activities; special education
7
509 - Historical, geographic & persons treatment
7
571 - Physiology & related subjects
7
670 - Manufacturing
7
158 - Applied psychology
6
516 - Geometry
6
570 - Life sciences; biology
6
690 - Buildings
6
001 - Knowledge
5
061 - Organizations in North America
5
510 - Mathematics
5
more ...