Classification
363 - Other social problems & services
900 - History & geography
14
700 - The arts; fine & decorative arts
10
330 - Economics
7
320 - Political science
5
333 - Economics of land & energy
4
581 - Specific topics in natural history
3
600 - Technology
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
300 - Social sciences
2
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
140 - Specific philosophical schools
1
301 - Sociology & anthropology
1
340 - Law
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
590 - Animals (Zoology)
1