Classification
320 - Political science
380 - Commerce, communications & transportation
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
620 - Engineering & allied operations
14
333 - Economics of land & energy
11
363 - Other social problems & services
10
330 - Economics
9
720 - Architecture
9
000 - Computer science, information & general works
8
140 - Specific philosophical schools
5
370 - Education
5
610 - Medicine & health
5
340 - Law
4
551 - Geology, hydrology & meteorology
4
576 - Genetics & evolution
4
400 - Language
3
500 - Natural sciences & mathematics
3
100 - Philosophy & psychology
2
200 - Religion
2
300 - Social sciences
2
304 - Factors affecting social behavior
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
658 - General management
2
780 - Music
2
301 - Sociology & anthropology
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1
580 - Plants (Botany)
1
800 - Literature & rhetoric
1