Classification
330 - Economics
340 - Law
320 - Political science
12
333 - Economics of land & energy
12
900 - History & geography
10
300 - Social sciences
9
380 - Commerce, communications & transportation
8
700 - The arts; fine & decorative arts
7
140 - Specific philosophical schools
6
100 - Philosophy & psychology
4
170 - Ethics
4
363 - Other social problems & services
4
630 - Agriculture & related technologies
4
581 - Specific topics in natural history
3
600 - Technology
3
361 - Social problems & social welfare in general
2
370 - Education
2
551 - Geology, hydrology & meteorology
2
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
400 - Language
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
780 - Music
1
791 - Public performances
1
800 - Literature & rhetoric
1