Classification
320 - Political science
100 - Philosophy & psychology
19
300 - Social sciences
19
900 - History & geography
19
333 - Economics of land & energy
18
330 - Economics
13
140 - Specific philosophical schools
11
380 - Commerce, communications & transportation
9
340 - Law
8
610 - Medicine & health
7
700 - The arts; fine & decorative arts
7
200 - Religion
6
363 - Other social problems & services
5
370 - Education
5
551 - Geology, hydrology & meteorology
4
600 - Technology
4
800 - Literature & rhetoric
4
301 - Sociology & anthropology
3
304 - Factors affecting social behavior
3
581 - Specific topics in natural history
3
620 - Engineering & allied operations
3
120 - Epistemology, causation & humankind
2
361 - Social problems & social welfare in general
2
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
305 - Social groups
1
360 - Social problems & services; associations
1
364 - Criminology
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
630 - Agriculture & related technologies
1
780 - Music
1
951 - China & adjacent areas
1
954 - South Asia; India
1