Classification
900 - History & geography
320 - Political science
8,365
330 - Economics
7,377
700 - The arts; fine & decorative arts
2,552
300 - Social sciences
2,098
600 - Technology
1,972
620 - Engineering & allied operations
1,839
800 - Literature & rhetoric
1,737
340 - Law
1,724
576 - Genetics & evolution
1,628
100 - Philosophy & psychology
1,035
200 - Religion
939
333 - Economics of land & energy
885
140 - Specific philosophical schools
766
610 - Medicine & health
585
363 - Other social problems & services
564
410 - Linguistics
518
380 - Commerce, communications & transportation
511
400 - Language
509
000 - Computer science, information & general works
478
301 - Sociology & anthropology
430
370 - Education
421
720 - Architecture
304
780 - Music
243
580 - Plants (Botany)
217
630 - Agriculture & related technologies
209
304 - Factors affecting social behavior
200
500 - Natural sciences & mathematics
184
170 - Ethics
160
297 - Islam, Babism & Bahai Faith
158
551 - Geology, hydrology & meteorology
142
530 - Physics
136
414 - Phonology & phonetics
124
791 - Public performances
113
296 - Judaism
106
581 - Specific topics in natural history
103
943 - Central Europe; Germany
89
540 - Chemistry & allied sciences
86
770 - Photography, photographs & computer art
73
830 - Literatures of Germanic languages
65
891 - East Indo-European & Celtic literatures
63
658 - General management
60
809 - History, description & criticism
54
120 - Epistemology, causation & humankind
43
361 - Social problems & social welfare in general
41
940 - History of Europe
41
160 - Logic
40
398 - Folklore
38
230 - Christianity & Christian theology
28
920 - Biography, genealogy & insignia
26
more ...