Classification
900 - History & geography
19
300 - Social sciences
13
100 - Philosophy & psychology
12
320 - Political science
12
610 - Medicine & health
12
333 - Economics of land & energy
10
140 - Specific philosophical schools
8
301 - Sociology & anthropology
7
200 - Religion
5
370 - Education
5
800 - Literature & rhetoric
5
330 - Economics
4
600 - Technology
4
297 - Islam, Babism & Bahai Faith
3
340 - Law
3
380 - Commerce, communications & transportation
3
000 - Computer science, information & general works
2
170 - Ethics
2
363 - Other social problems & services
2
364 - Criminology
2
400 - Language
2
581 - Specific topics in natural history
2
304 - Factors affecting social behavior
1
410 - Linguistics
1
576 - Genetics & evolution
1
658 - General management
1
700 - The arts; fine & decorative arts
1
780 - Music
1
880 - Hellenic literatures; classical Greek
1