Classification
100 - Philosophy & psychology
581 - Specific topics in natural history
140 - Specific philosophical schools
6
363 - Other social problems & services
5
320 - Political science
3
170 - Ethics
2
330 - Economics
2
333 - Economics of land & energy
2
700 - The arts; fine & decorative arts
2
200 - Religion
1
300 - Social sciences
1
301 - Sociology & anthropology
1
340 - Law
1
370 - Education
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
600 - Technology
1
610 - Medicine & health
1
780 - Music
1
900 - History & geography
1