Classification
330 - Economics
380 - Commerce, communications & transportation
576 - Genetics & evolution
630 - Agriculture & related technologies
700 - The arts; fine & decorative arts
333 - Economics of land & energy
2
600 - Technology
2
200 - Religion
1
304 - Factors affecting social behavior
1
320 - Political science
1
340 - Law
1
363 - Other social problems & services
1
370 - Education
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
720 - Architecture
1
900 - History & geography
1