Classification
006 - Special computer methods
101
005 - Computer programming, programs & data
50
658 - General management
42
004 - Data processing & computer science
34
621 - Applied physics
31
304 - Factors affecting social behavior
30
620 - Engineering & allied operations
30
616 - Diseases
29
320 - Political science
24
003 - Systems
23
617 - Surgery & related medical specialties
19
338 - Production
16
363 - Other social problems & services
16
327 - International relations
14
551 - Geology, hydrology & meteorology
14
519 - Probabilities & applied mathematics
13
530 - Physics
13
306 - Culture & institutions
12
610 - Medicine & health
11
040 - [Unassigned]
10
333 - Economics of land & energy
10
370 - Education
10
629 - Other branches of engineering
10
809 - History, description & criticism
10
330 - Economics
9
332 - Financial economics
9
579 - Microorganisms, fungi & algae
9
660 - Chemical engineering
9
910 - Geography & travel
9
062 - Organizations in British Isles; in England
8
628 - Sanitary & municipal engineering
8
150 - Psychology
7
340 - Law
7
515 - Analysis
7
571 - Physiology & related subjects
7
302 - Social interaction
6
305 - Social groups
6
371 - Schools & their activities; special education
6
509 - Historical, geographic & persons treatment
6
512 - Algebra
6
516 - Geometry
6
570 - Life sciences; biology
6
624 - Civil engineering
6
301 - Sociology & anthropology
5
577 - Ecology
5
670 - Manufacturing
5
025 - Library operations
4
364 - Criminology
4
378 - Higher education
4
381 - Commerce
4
more ...