Classification
900 - History & geography
320 - Political science
8,480
330 - Economics
7,394
700 - The arts; fine & decorative arts
2,746
300 - Social sciences
2,311
600 - Technology
2,009
620 - Engineering & allied operations
1,840
800 - Literature & rhetoric
1,838
340 - Law
1,795
576 - Genetics & evolution
1,644
100 - Philosophy & psychology
1,168
200 - Religion
1,134
333 - Economics of land & energy
944
140 - Specific philosophical schools
733
610 - Medicine & health
634
400 - Language
613
363 - Other social problems & services
597
380 - Commerce, communications & transportation
565
000 - Computer science, information & general works
539
370 - Education
519
410 - Linguistics
497
301 - Sociology & anthropology
486
720 - Architecture
322
780 - Music
271
304 - Factors affecting social behavior
228
580 - Plants (Botany)
222
630 - Agriculture & related technologies
221
500 - Natural sciences & mathematics
202
170 - Ethics
190
297 - Islam, Babism & Bahai Faith
181
551 - Geology, hydrology & meteorology
142
530 - Physics
133
414 - Phonology & phonetics
127
296 - Judaism
109
581 - Specific topics in natural history
104
540 - Chemistry & allied sciences
90
943 - Central Europe; Germany
89
770 - Photography, photographs & computer art
85
791 - Public performances
78
658 - General management
66
830 - Literatures of Germanic languages
65
891 - East Indo-European & Celtic literatures
63
120 - Epistemology, causation & humankind
54
809 - History, description & criticism
54
361 - Social problems & social welfare in general
52
160 - Logic
45
398 - Folklore
44
940 - History of Europe
41
230 - Christianity & Christian theology
28
364 - Criminology
28
more ...