Classification
304 - Factors affecting social behavior
320 - Political science
330 - Economics
900 - History & geography
300 - Social sciences
6
333 - Economics of land & energy
4
600 - Technology
4
700 - The arts; fine & decorative arts
4
140 - Specific philosophical schools
3
363 - Other social problems & services
3
370 - Education
3
380 - Commerce, communications & transportation
3
100 - Philosophy & psychology
2
170 - Ethics
2
301 - Sociology & anthropology
2
340 - Law
2
000 - Computer science, information & general works
1
200 - Religion
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
550 - Earth sciences
1
580 - Plants (Botany)
1
620 - Engineering & allied operations
1
800 - Literature & rhetoric
1