Classification
300 - Social sciences
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
600 - Technology
320 - Political science
4
370 - Education
2
551 - Geology, hydrology & meteorology
2
000 - Computer science, information & general works
1
200 - Religion
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
400 - Language
1
610 - Medicine & health
1
650 - Management & auxiliary services
1
657 - Accounting
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1