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