Classification
551 - Geology, hydrology & meteorology
581 - Specific topics in natural history
333 - Economics of land & energy
5
580 - Plants (Botany)
4
630 - Agriculture & related technologies
4
700 - The arts; fine & decorative arts
4
000 - Computer science, information & general works
3
330 - Economics
3
600 - Technology
3
363 - Other social problems & services
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
900 - History & geography
2
140 - Specific philosophical schools
1
200 - Religion
1
304 - Factors affecting social behavior
1
320 - Political science
1
380 - Commerce, communications & transportation
1
410 - Linguistics
1