Classification
140 - Specific philosophical schools
300 - Social sciences
330 - Economics
363 - Other social problems & services
333 - Economics of land & energy
5
320 - Political science
3
551 - Geology, hydrology & meteorology
3
600 - Technology
3
340 - Law
2
370 - Education
2
581 - Specific topics in natural history
2
610 - Medicine & health
2
630 - Agriculture & related technologies
2
700 - The arts; fine & decorative arts
2
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
400 - Language
1
500 - Natural sciences & mathematics
1
620 - Engineering & allied operations
1
900 - History & geography
1