Classification
320 - Political science
330 - Economics
333 - Economics of land & energy
380 - Commerce, communications & transportation
700 - The arts; fine & decorative arts
900 - History & geography
363 - Other social problems & services
7
600 - Technology
6
000 - Computer science, information & general works
5
370 - Education
4
551 - Geology, hydrology & meteorology
4
581 - Specific topics in natural history
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
720 - Architecture
3
140 - Specific philosophical schools
2
300 - Social sciences
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
414 - Phonology & phonetics
1
580 - Plants (Botany)
1
630 - Agriculture & related technologies
1
658 - General management
1