Classification
330 - Economics
363 - Other social problems & services
581 - Specific topics in natural history
333 - Economics of land & energy
6
000 - Computer science, information & general works
4
576 - Genetics & evolution
4
140 - Specific philosophical schools
3
320 - Political science
3
551 - Geology, hydrology & meteorology
3
700 - The arts; fine & decorative arts
3
900 - History & geography
3
304 - Factors affecting social behavior
2
380 - Commerce, communications & transportation
2
600 - Technology
2
100 - Philosophy & psychology
1
170 - Ethics
1
300 - Social sciences
1
301 - Sociology & anthropology
1
370 - Education
1
410 - Linguistics
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
657 - Accounting
1
800 - Literature & rhetoric
1