Classification
000 - Computer science, information & general works
320 - Political science
370 - Education
380 - Commerce, communications & transportation
600 - Technology
330 - Economics
6
700 - The arts; fine & decorative arts
6
333 - Economics of land & energy
4
610 - Medicine & health
4
363 - Other social problems & services
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
300 - Social sciences
2
551 - Geology, hydrology & meteorology
2
720 - Architecture
2
900 - History & geography
2
170 - Ethics
1
304 - Factors affecting social behavior
1
400 - Language
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
658 - General management
1
780 - Music
1