Classification
330 - Economics
370 - Education
600 - Technology
800 - Literature & rhetoric
3
333 - Economics of land & energy
2
363 - Other social problems & services
2
610 - Medicine & health
2
658 - General management
2
700 - The arts; fine & decorative arts
2
900 - History & geography
2
100 - Philosophy & psychology
1
320 - Political science
1
380 - Commerce, communications & transportation
1
576 - Genetics & evolution
1
620 - Engineering & allied operations
1