Classification
006 - Special computer methods
81
005 - Computer programming, programs & data
49
621 - Applied physics
41
620 - Engineering & allied operations
33
658 - General management
31
616 - Diseases
29
320 - Political science
24
304 - Factors affecting social behavior
20
629 - Other branches of engineering
20
617 - Surgery & related medical specialties
19
306 - Culture & institutions
18
004 - Data processing & computer science
12
327 - International relations
12
330 - Economics
11
551 - Geology, hydrology & meteorology
11
610 - Medicine & health
11
612 - Human physiology
11
809 - History, description & criticism
11
003 - Systems
10
530 - Physics
10
150 - Psychology
9
338 - Production
9
370 - Education
9
515 - Analysis
9
519 - Probabilities & applied mathematics
9
333 - Economics of land & energy
8
340 - Law
8
660 - Chemical engineering
8
062 - Organizations in British Isles; in England
7
571 - Physiology & related subjects
7
628 - Sanitary & municipal engineering
7
670 - Manufacturing
7
363 - Other social problems & services
6
378 - Higher education
6
040 - [Unassigned]
5
510 - Mathematics
5
512 - Algebra
5
570 - Life sciences; biology
5
577 - Ecology
5
341 - Law of nations
4
343 - Military, tax, trade & industrial law
4
509 - Historical, geographic & persons treatment
4
550 - Earth sciences
4
580 - Plants (Botany)
4
618 - Gynecology, obstetrics, pediatrics & geriatrics
4
631 - Techniques, equipment & materials
4
791 - Public performances
4
174 - Occupational ethics
3
190 - Modern western philosophy
3
300 - Social sciences
3
more ...