Classification
000 - Computer science, information & general works
140 - Specific philosophical schools
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
333 - Economics of land & energy
3
657 - Accounting
3
320 - Political science
2
370 - Education
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
581 - Specific topics in natural history
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
414 - Phonology & phonetics
1
580 - Plants (Botany)
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
900 - History & geography
1