Classification
170 - Ethics
333 - Economics of land & energy
320 - Political science
5
330 - Economics
5
363 - Other social problems & services
5
700 - The arts; fine & decorative arts
5
140 - Specific philosophical schools
4
600 - Technology
4
620 - Engineering & allied operations
4
100 - Philosophy & psychology
3
200 - Religion
3
370 - Education
3
610 - Medicine & health
3
340 - Law
2
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
304 - Factors affecting social behavior
1
380 - Commerce, communications & transportation
1
410 - Linguistics
1
580 - Plants (Botany)
1
630 - Agriculture & related technologies
1
900 - History & geography
1