Classification
320 - Political science
330 - Economics
370 - Education
380 - Commerce, communications & transportation
600 - Technology
3
000 - Computer science, information & general works
2
300 - Social sciences
2
363 - Other social problems & services
2
140 - Specific philosophical schools
1
200 - Religion
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
700 - The arts; fine & decorative arts
1
720 - Architecture
1
900 - History & geography
1