Classification
300 - Social sciences
370 - Education
900 - History & geography
100 - Philosophy & psychology
8
320 - Political science
5
330 - Economics
4
600 - Technology
4
140 - Specific philosophical schools
3
340 - Law
3
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
333 - Economics of land & energy
2
380 - Commerce, communications & transportation
2
620 - Engineering & allied operations
2
170 - Ethics
1
200 - Religion
1
363 - Other social problems & services
1
400 - Language
1
500 - Natural sciences & mathematics
1
530 - Physics
1
576 - Genetics & evolution
1
658 - General management
1
700 - The arts; fine & decorative arts
1
770 - Photography, photographs & computer art
1
800 - Literature & rhetoric
1