Classification
304 - Factors affecting social behavior
140 - Specific philosophical schools
2
320 - Political science
2
551 - Geology, hydrology & meteorology
2
100 - Philosophy & psychology
1
330 - Economics
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
700 - The arts; fine & decorative arts
1
800 - Literature & rhetoric
1
900 - History & geography
1