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