Classification
320 - Political science
330 - Economics
333 - Economics of land & energy
28
300 - Social sciences
20
900 - History & geography
18
700 - The arts; fine & decorative arts
17
363 - Other social problems & services
16
140 - Specific philosophical schools
11
340 - Law
11
380 - Commerce, communications & transportation
11
000 - Computer science, information & general works
10
304 - Factors affecting social behavior
7
361 - Social problems & social welfare in general
7
100 - Philosophy & psychology
6
301 - Sociology & anthropology
6
600 - Technology
5
360 - Social problems & services; associations
4
610 - Medicine & health
4
800 - Literature & rhetoric
4
170 - Ethics
3
200 - Religion
3
630 - Agriculture & related technologies
3
780 - Music
3
370 - Education
2
400 - Language
2
410 - Linguistics
2
551 - Geology, hydrology & meteorology
2
580 - Plants (Botany)
2
620 - Engineering & allied operations
2
658 - General management
2
120 - Epistemology, causation & humankind
1
297 - Islam, Babism & Bahai Faith
1
336 - Public finance
1
350 - Public administration & military science
1
364 - Criminology
1
581 - Specific topics in natural history
1
770 - Photography, photographs & computer art
1