Classification
630 - Agriculture & related technologies
330 - Economics
4
333 - Economics of land & energy
4
140 - Specific philosophical schools
2
320 - Political science
2
340 - Law
2
363 - Other social problems & services
2
380 - Commerce, communications & transportation
2
551 - Geology, hydrology & meteorology
2
600 - Technology
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
2
304 - Factors affecting social behavior
1
370 - Education
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
658 - General management
1
900 - History & geography
1