Classification
300 - Social sciences
330 - Economics
45
320 - Political science
43
301 - Sociology & anthropology
9
900 - History & geography
9
140 - Specific philosophical schools
7
363 - Other social problems & services
5
610 - Medicine & health
5
700 - The arts; fine & decorative arts
5
170 - Ethics
4
340 - Law
4
370 - Education
4
380 - Commerce, communications & transportation
4
000 - Computer science, information & general works
3
100 - Philosophy & psychology
3
304 - Factors affecting social behavior
3
333 - Economics of land & energy
3
600 - Technology
3
630 - Agriculture & related technologies
3
658 - General management
3
551 - Geology, hydrology & meteorology
2
200 - Religion
1
302 - Social interaction
1
381 - Commerce
1
400 - Language
1
500 - Natural sciences & mathematics
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
670 - Manufacturing
1
800 - Literature & rhetoric
1