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