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