Classification
620 - Engineering & allied operations
600 - Technology
14
900 - History & geography
14
700 - The arts; fine & decorative arts
7
333 - Economics of land & energy
4
000 - Computer science, information & general works
3
330 - Economics
2
576 - Genetics & evolution
2
140 - Specific philosophical schools
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
612 - Human physiology
1
781 - General principles & musical forms
1
800 - Literature & rhetoric
1