Classification
580 - Plants (Botany)
333 - Economics of land & energy
18
600 - Technology
18
900 - History & geography
15
363 - Other social problems & services
14
620 - Engineering & allied operations
13
700 - The arts; fine & decorative arts
11
000 - Computer science, information & general works
10
330 - Economics
10
414 - Phonology & phonetics
5
540 - Chemistry & allied sciences
4
581 - Specific topics in natural history
4
610 - Medicine & health
4
140 - Specific philosophical schools
3
576 - Genetics & evolution
3
630 - Agriculture & related technologies
3
720 - Architecture
3
380 - Commerce, communications & transportation
2
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
320 - Political science
1
370 - Education
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
658 - General management
1
780 - Music
1
800 - Literature & rhetoric
1