Classification
000 - Computer science, information & general works
4
380 - Commerce, communications & transportation
330 - Economics
3
333 - Economics of land & energy
3
363 - Other social problems & services
3
140 - Specific philosophical schools
1
414 - Phonology & phonetics
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
600 - Technology
1
658 - General management
1
900 - History & geography
1