Classification
363 - Other social problems & services
630 - Agriculture & related technologies
600 - Technology
5
000 - Computer science, information & general works
4
333 - Economics of land & energy
4
700 - The arts; fine & decorative arts
4
330 - Economics
3
581 - Specific topics in natural history
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
900 - History & geography
3
140 - Specific philosophical schools
2
304 - Factors affecting social behavior
2
320 - Political science
2
340 - Law
2
580 - Plants (Botany)
2
612 - Human physiology
2
301 - Sociology & anthropology
1
350 - Public administration & military science
1
370 - Education
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1