Classification
330 - Economics
380 - Commerce, communications & transportation
600 - Technology
610 - Medicine & health
700 - The arts; fine & decorative arts
333 - Economics of land & energy
12
900 - History & geography
9
140 - Specific philosophical schools
8
000 - Computer science, information & general works
7
363 - Other social problems & services
7
620 - Engineering & allied operations
6
320 - Political science
5
370 - Education
4
551 - Geology, hydrology & meteorology
4
658 - General management
4
720 - Architecture
4
800 - Literature & rhetoric
4
500 - Natural sciences & mathematics
3
576 - Genetics & evolution
3
304 - Factors affecting social behavior
2
400 - Language
2
414 - Phonology & phonetics
1