Classification
900 - History & geography
81
320 - Political science
70
333 - Economics of land & energy
33
700 - The arts; fine & decorative arts
29
363 - Other social problems & services
27
304 - Factors affecting social behavior
24
301 - Sociology & anthropology
23
414 - Phonology & phonetics
21
398 - Folklore
20
551 - Geology, hydrology & meteorology
20
330 - Economics
19
800 - Literature & rhetoric
18
000 - Computer science, information & general works
14
780 - Music
14
581 - Specific topics in natural history
12
720 - Architecture
11
400 - Language
10
610 - Medicine & health
10
380 - Commerce, communications & transportation
7
200 - Religion
6
140 - Specific philosophical schools
5
300 - Social sciences
5
370 - Education
5
410 - Linguistics
5
580 - Plants (Botany)
5
600 - Technology
3
630 - Agriculture & related technologies
3
100 - Philosophy & psychology
1
590 - Animals (Zoology)
1
657 - Accounting
1
920 - Biography, genealogy & insignia
1