Classification
000 - Computer science, information & general works
1
140 - Specific philosophical schools
4
170 - Ethics
1
320 - Political science
3
330 - Economics
3
333 - Economics of land & energy
4
363 - Other social problems & services
3
380 - Commerce, communications & transportation
2
414 - Phonology & phonetics
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
600 - Technology
2
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
4
900 - History & geography