Classification
304 - Factors affecting social behavior
333 - Economics of land & energy
380 - Commerce, communications & transportation
320 - Political science
4
610 - Medicine & health
4
140 - Specific philosophical schools
3
330 - Economics
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1