Classification
330 - Economics
2
600 - Technology
700 - The arts; fine & decorative arts
2
900 - History & geography
140 - Specific philosophical schools
1
200 - Religion
1
304 - Factors affecting social behavior
1
320 - Political science
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1