Classification
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
414 - Phonology & phonetics
000 - Computer science, information & general works
5
333 - Economics of land & energy
4
700 - The arts; fine & decorative arts
4
140 - Specific philosophical schools
3
320 - Political science
3
370 - Education
2
551 - Geology, hydrology & meteorology
2
610 - Medicine & health
2
900 - History & geography
2
304 - Factors affecting social behavior
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
600 - Technology
1