Classification
140 - Specific philosophical schools
2
320 - Political science
333 - Economics of land & energy
2
363 - Other social problems & services
700 - The arts; fine & decorative arts
2
720 - Architecture
000 - Computer science, information & general works
1
304 - Factors affecting social behavior
1
330 - Economics
1
370 - Education
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
600 - Technology
1