Classification
330 - Economics
3
333 - Economics of land & energy
3
363 - Other social problems & services
3
370 - Education
3
600 - Technology
551 - Geology, hydrology & meteorology
2
610 - Medicine & health
2
300 - Social sciences
1
320 - Political science
1
380 - Commerce, communications & transportation
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
658 - General management
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1