Classification
140 - Specific philosophical schools
320 - Political science
380 - Commerce, communications & transportation
581 - Specific topics in natural history
363 - Other social problems & services
6
700 - The arts; fine & decorative arts
6
900 - History & geography
5
000 - Computer science, information & general works
4
333 - Economics of land & energy
4
600 - Technology
4
200 - Religion
3
330 - Economics
3
361 - Social problems & social welfare in general
2
620 - Engineering & allied operations
2
100 - Philosophy & psychology
1
297 - Islam, Babism & Bahai Faith
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
370 - Education
1
400 - Language
1
414 - Phonology & phonetics
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
610 - Medicine & health
1
800 - Literature & rhetoric
1