Classification
320 - Political science
363 - Other social problems & services
576 - Genetics & evolution
900 - History & geography
600 - Technology
5
700 - The arts; fine & decorative arts
5
620 - Engineering & allied operations
4
140 - Specific philosophical schools
3
300 - Social sciences
3
340 - Law
3
380 - Commerce, communications & transportation
3
500 - Natural sciences & mathematics
3
720 - Architecture
3
100 - Philosophy & psychology
2
330 - Economics
2
333 - Economics of land & energy
2
581 - Specific topics in natural history
2
000 - Computer science, information & general works
1
301 - Sociology & anthropology
1
350 - Public administration & military science
1
551 - Geology, hydrology & meteorology
1
610 - Medicine & health
1