Classification
300 - Social sciences
320 - Political science
350 - Public administration & military science
330 - Economics
9
333 - Economics of land & energy
3
600 - Technology
3
301 - Sociology & anthropology
2
363 - Other social problems & services
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
630 - Agriculture & related technologies
2
900 - History & geography
2
100 - Philosophy & psychology
1
336 - Public finance
1
370 - Education
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
657 - Accounting
1
700 - The arts; fine & decorative arts
1