Classification
320 - Political science
330 - Economics
581 - Specific topics in natural history
900 - History & geography
363 - Other social problems & services
8
333 - Economics of land & energy
7
700 - The arts; fine & decorative arts
5
000 - Computer science, information & general works
4
140 - Specific philosophical schools
4
551 - Geology, hydrology & meteorology
4
300 - Social sciences
3
380 - Commerce, communications & transportation
3
600 - Technology
3
100 - Philosophy & psychology
2
370 - Education
2
576 - Genetics & evolution
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
170 - Ethics
1
301 - Sociology & anthropology
1
350 - Public administration & military science
1
414 - Phonology & phonetics
1
530 - Physics
1