Classification
300 - Social sciences
581 - Specific topics in natural history
363 - Other social problems & services
7
140 - Specific philosophical schools
4
320 - Political science
4
330 - Economics
3
551 - Geology, hydrology & meteorology
3
600 - Technology
3
700 - The arts; fine & decorative arts
2
200 - Religion
1
333 - Economics of land & energy
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
620 - Engineering & allied operations
1
800 - Literature & rhetoric
1
900 - History & geography
1