Classification
330 - Economics
416
900 - History & geography
317
301 - Sociology & anthropology
262
320 - Political science
222
333 - Economics of land & energy
153
300 - Social sciences
148
200 - Religion
136
700 - The arts; fine & decorative arts
124
304 - Factors affecting social behavior
105
370 - Education
92
610 - Medicine & health
89
363 - Other social problems & services
74
140 - Specific philosophical schools
72
820 - English & Old English literatures
65
000 - Computer science, information & general works
60
305 - Social groups
60
380 - Commerce, communications & transportation
60
600 - Technology
60
331 - Labor economics
52
004 - Data processing & computer science
50
340 - Law
46
658 - General management
44
800 - Literature & rhetoric
40
400 - Language
38
297 - Islam, Babism & Bahai Faith
36
100 - Philosophy & psychology
35
362 - Social welfare problems & services
32
296 - Judaism
28
005 - Computer programming, programs & data
27
158 - Applied psychology
24
630 - Agriculture & related technologies
24
500 - Natural sciences & mathematics
23
780 - Music
23
170 - Ethics
22
930 - History of ancient world to ca. 499
22
650 - Management & auxiliary services
21
302 - Social interaction
20
338 - Production
19
551 - Geology, hydrology & meteorology
19
940 - History of Europe
19
371 - Schools & their activities; special education
18
570 - Life sciences; biology
18
576 - Genetics & evolution
18
361 - Social problems & social welfare in general
16
306 - Culture & institutions
15
336 - Public finance
15
620 - Engineering & allied operations
15
332 - Financial economics
14
581 - Specific topics in natural history
14
006 - Special computer methods
13
more ...