Classification
300 - Social sciences
3,424
320 - Political science
2,059
330 - Economics
1,593
900 - History & geography
856
005 - Computer programming, programs & data
814
004 - Data processing & computer science
778
280 - Christian denominations & sects
713
820 - English & Old English literatures
629
700 - The arts; fine & decorative arts
569
370 - Education
564
301 - Sociology & anthropology
520
303 - Social processes
405
100 - Philosophy & psychology
402
340 - Law
378
610 - Medicine & health
346
000 - Computer science, information & general works
342
306 - Culture & institutions
337
600 - Technology
327
333 - Economics of land & energy
282
304 - Factors affecting social behavior
264
140 - Specific philosophical schools
249
200 - Religion
247
006 - Special computer methods
218
363 - Other social problems & services
199
305 - Social groups
172
380 - Commerce, communications & transportation
169
800 - Literature & rhetoric
162
364 - Criminology
158
361 - Social problems & social welfare in general
144
630 - Agriculture & related technologies
137
620 - Engineering & allied operations
127
170 - Ethics
120
360 - Social problems & services; associations
118
658 - General management
108
500 - Natural sciences & mathematics
100
400 - Language
92
302 - Social interaction
90
576 - Genetics & evolution
69
780 - Music
66
551 - Geology, hydrology & meteorology
63
260 - Social & ecclesiastical theology
57
621 - Applied physics
57
338 - Production
54
297 - Islam, Babism & Bahai Faith
51
410 - Linguistics
50
580 - Plants (Botany)
48
720 - Architecture
47
371 - Schools & their activities; special education
46
240 - Christian moral & devotional theology
42
581 - Specific topics in natural history
41
more ...