Classification
580 - Plants (Botany)
610 - Medicine & health
13
000 - Computer science, information & general works
8
700 - The arts; fine & decorative arts
7
333 - Economics of land & energy
6
363 - Other social problems & services
4
380 - Commerce, communications & transportation
4
600 - Technology
4
581 - Specific topics in natural history
3
620 - Engineering & allied operations
3
140 - Specific philosophical schools
2
500 - Natural sciences & mathematics
2
540 - Chemistry & allied sciences
2
551 - Geology, hydrology & meteorology
2
615 - Pharmacology & therapeutics
2
330 - Economics
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1
900 - History & geography
1