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