Classification
300 - Social sciences
71
320 - Political science
33
330 - Economics
26
700 - The arts; fine & decorative arts
25
720 - Architecture
25
333 - Economics of land & energy
24
140 - Specific philosophical schools
22
900 - History & geography
22
301 - Sociology & anthropology
21
363 - Other social problems & services
13
304 - Factors affecting social behavior
8
800 - Literature & rhetoric
7
551 - Geology, hydrology & meteorology
6
600 - Technology
6
581 - Specific topics in natural history
5
340 - Law
4
380 - Commerce, communications & transportation
4
620 - Engineering & allied operations
4
297 - Islam, Babism & Bahai Faith
3
364 - Criminology
3
610 - Medicine & health
3
780 - Music
3
170 - Ethics
2
200 - Religion
2
370 - Education
2
630 - Agriculture & related technologies
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
307 - Communities
1
335 - Socialism & related systems
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
388 - Transportation; ground transportation
1
400 - Language
1
576 - Genetics & evolution
1
770 - Photography, photographs & computer art
1
791 - Public performances
1