Classification
320 - Political science
380 - Commerce, communications & transportation
330 - Economics
4
333 - Economics of land & energy
4
000 - Computer science, information & general works
2
301 - Sociology & anthropology
2
363 - Other social problems & services
2
370 - Education
2
581 - Specific topics in natural history
2
600 - Technology
2
630 - Agriculture & related technologies
2
700 - The arts; fine & decorative arts
2
900 - History & geography
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
297 - Islam, Babism & Bahai Faith
1
400 - Language
1
551 - Geology, hydrology & meteorology
1
610 - Medicine & health
1
658 - General management
1
800 - Literature & rhetoric
1