Classification
330 - Economics
837
320 - Political science
737
900 - History & geography
448
700 - The arts; fine & decorative arts
224
340 - Law
218
300 - Social sciences
181
333 - Economics of land & energy
155
363 - Other social problems & services
141
610 - Medicine & health
120
140 - Specific philosophical schools
112
370 - Education
110
341 - Law of nations
97
800 - Literature & rhetoric
89
000 - Computer science, information & general works
88
355 - Military science
84
304 - Factors affecting social behavior
82
380 - Commerce, communications & transportation
77
200 - Religion
75
600 - Technology
73
100 - Philosophy & psychology
65
301 - Sociology & anthropology
60
551 - Geology, hydrology & meteorology
53
400 - Language
46
910 - Geography & travel
45
327 - International relations
40
620 - Engineering & allied operations
40
630 - Agriculture & related technologies
35
820 - English & Old English literatures
35
500 - Natural sciences & mathematics
33
581 - Specific topics in natural history
32
170 - Ethics
31
580 - Plants (Botany)
31
658 - General management
29
305 - Social groups
28
940 - History of Europe
25
943 - Central Europe; Germany
25
362 - Social welfare problems & services
24
576 - Genetics & evolution
24
780 - Music
24
297 - Islam, Babism & Bahai Faith
23
338 - Production
22
361 - Social problems & social welfare in general
22
303 - Social processes
20
410 - Linguistics
20
342 - Constitutional & administrative law
19
350 - Public administration & military science
18
306 - Culture & institutions
17
720 - Architecture
17
331 - Labor economics
16
374 - Adult education
16
more ...