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