Classification
630 - Agriculture & related technologies
363 - Other social problems & services
9
600 - Technology
7
000 - Computer science, information & general works
5
320 - Political science
5
330 - Economics
5
340 - Law
5
580 - Plants (Botany)
5
620 - Engineering & allied operations
5
700 - The arts; fine & decorative arts
5
380 - Commerce, communications & transportation
4
551 - Geology, hydrology & meteorology
4
610 - Medicine & health
4
333 - Economics of land & energy
3
581 - Specific topics in natural history
3
300 - Social sciences
2
612 - Human physiology
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
170 - Ethics
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
800 - Literature & rhetoric
1
900 - History & geography
1