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