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