Classification
580 - Plants (Botany)
333 - Economics of land & energy
13
330 - Economics
12
600 - Technology
12
363 - Other social problems & services
9
000 - Computer science, information & general works
8
620 - Engineering & allied operations
8
610 - Medicine & health
6
140 - Specific philosophical schools
5
700 - The arts; fine & decorative arts
5
900 - History & geography
5
380 - Commerce, communications & transportation
4
630 - Agriculture & related technologies
3
658 - General management
3
320 - Political science
2
540 - Chemistry & allied sciences
2
551 - Geology, hydrology & meteorology
2
612 - Human physiology
2
297 - Islam, Babism & Bahai Faith
1
530 - Physics
1
581 - Specific topics in natural history
1
800 - Literature & rhetoric
1