Classification
300 - Social sciences
330 - Economics
4
340 - Law
370 - Education
600 - Technology
100 - Philosophy & psychology
3
140 - Specific philosophical schools
3
320 - Political science
3
620 - Engineering & allied operations
3
900 - History & geography
3
301 - Sociology & anthropology
2
400 - Language
2
700 - The arts; fine & decorative arts
2
170 - Ethics
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
658 - General management
1
780 - Music
1