Classification
000 - Computer science, information & general works
6
363 - Other social problems & services
6
330 - Economics
5
581 - Specific topics in natural history
5
580 - Plants (Botany)
4
140 - Specific philosophical schools
3
333 - Economics of land & energy
3
380 - Commerce, communications & transportation
3
700 - The arts; fine & decorative arts
3
500 - Natural sciences & mathematics
2
551 - Geology, hydrology & meteorology
2
577 - Ecology
2
720 - Architecture
2
304 - Factors affecting social behavior
1
414 - Phonology & phonetics
1
576 - Genetics & evolution
1
610 - Medicine & health
1
612 - Human physiology
1
920 - Biography, genealogy & insignia
1