Classification
363 - Other social problems & services
333 - Economics of land & energy
6
320 - Political science
4
330 - Economics
4
600 - Technology
2
620 - Engineering & allied operations
2
630 - Agriculture & related technologies
2
800 - Literature & rhetoric
2
140 - Specific philosophical schools
1
200 - Religion
1
304 - Factors affecting social behavior
1
400 - Language
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
700 - The arts; fine & decorative arts
1
770 - Photography, photographs & computer art
1
780 - Music
1
900 - History & geography
1