Classification
330 - Economics
1,022
320 - Political science
975
340 - Law
135
300 - Social sciences
127
900 - History & geography
116
630 - Agriculture & related technologies
33
576 - Genetics & evolution
30
700 - The arts; fine & decorative arts
18
370 - Education
17
200 - Religion
15
610 - Medicine & health
15
306 - Culture & institutions
13
338 - Production
13
658 - General management
13
500 - Natural sciences & mathematics
12
519 - Probabilities & applied mathematics
11
820 - English & Old English literatures
10
616 - Diseases
9
301 - Sociology & anthropology
8
332 - Financial economics
8
000 - Computer science, information & general works
7
140 - Specific philosophical schools
7
170 - Ethics
7
327 - International relations
7
363 - Other social problems & services
7
800 - Literature & rhetoric
7
004 - Data processing & computer science
6
005 - Computer programming, programs & data
6
100 - Philosophy & psychology
6
331 - Labor economics
6
303 - Social processes
5
304 - Factors affecting social behavior
5
333 - Economics of land & energy
5
612 - Human physiology
5
809 - History, description & criticism
5
006 - Special computer methods
4
302 - Social interaction
4
305 - Social groups
4
368 - Insurance
4
380 - Commerce, communications & transportation
4
510 - Mathematics
4
551 - Geology, hydrology & meteorology
4
617 - Surgery & related medical specialties
4
650 - Management & auxiliary services
4
780 - Music
4
909 - World history
4
951 - China & adjacent areas
4
109 - Historical & collected persons treatment
3
142 - Critical philosophy
3
294 - Religions of Indic origin
3
more ...