Classification
610 - Medicine & health
11
000 - Computer science, information & general works
9
333 - Economics of land & energy
7
580 - Plants (Botany)
7
570 - Life sciences; biology
6
576 - Genetics & evolution
6
700 - The arts; fine & decorative arts
6
620 - Engineering & allied operations
5
900 - History & geography
4
380 - Commerce, communications & transportation
3
581 - Specific topics in natural history
3
600 - Technology
3
630 - Agriculture & related technologies
3
720 - Architecture
3
100 - Philosophy & psychology
2
363 - Other social problems & services
2
551 - Geology, hydrology & meteorology
2
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
364 - Criminology
1
414 - Phonology & phonetics
1
800 - Literature & rhetoric
1