Classification
320 - Political science
53
330 - Economics
46
304 - Factors affecting social behavior
28
340 - Law
28
333 - Economics of land & energy
26
820 - English & Old English literatures
24
004 - Data processing & computer science
22
610 - Medicine & health
20
616 - Diseases
18
900 - History & geography
18
300 - Social sciences
17
005 - Computer programming, programs & data
16
621 - Applied physics
16
006 - Special computer methods
15
338 - Production
13
530 - Physics
13
301 - Sociology & anthropology
9
341 - Law of nations
9
364 - Criminology
9
658 - General management
9
327 - International relations
8
363 - Other social problems & services
8
519 - Probabilities & applied mathematics
7
572 - Biochemistry
7
577 - Ecology
7
636 - Animal husbandry
7
337 - International economics
6
510 - Mathematics
6
551 - Geology, hydrology & meteorology
6
617 - Surgery & related medical specialties
6
620 - Engineering & allied operations
6
700 - The arts; fine & decorative arts
6
001 - Knowledge
5
140 - Specific philosophical schools
5
280 - Christian denominations & sects
5
306 - Culture & institutions
5
370 - Education
5
380 - Commerce, communications & transportation
5
500 - Natural sciences & mathematics
5
571 - Physiology & related subjects
5
641 - Food & drink
5
664 - Food technology
5
170 - Ethics
4
200 - Religion
4
307 - Communities
4
331 - Labor economics
4
515 - Analysis
4
541 - Physical chemistry
4
630 - Agriculture & related technologies
4
940 - History of Europe
4
more ...