Classification
320 - Political science
333 - Economics of land & energy
363 - Other social problems & services
610 - Medicine & health
7
700 - The arts; fine & decorative arts
5
330 - Economics
4
370 - Education
4
000 - Computer science, information & general works
3
140 - Specific philosophical schools
3
600 - Technology
3
620 - Engineering & allied operations
2
100 - Philosophy & psychology
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
340 - Law
1
361 - Social problems & social welfare in general
1
380 - Commerce, communications & transportation
1
550 - Earth sciences
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
900 - History & geography
1