Classification
333 - Economics of land & energy
580 - Plants (Botany)
600 - Technology
700 - The arts; fine & decorative arts
26
620 - Engineering & allied operations
25
900 - History & geography
19
330 - Economics
12
363 - Other social problems & services
12
000 - Computer science, information & general works
10
414 - Phonology & phonetics
6
576 - Genetics & evolution
6
610 - Medicine & health
6
380 - Commerce, communications & transportation
5
630 - Agriculture & related technologies
3
720 - Architecture
3
140 - Specific philosophical schools
2
304 - Factors affecting social behavior
2
500 - Natural sciences & mathematics
2
530 - Physics
2
340 - Law
1
410 - Linguistics
1
540 - Chemistry & allied sciences
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
658 - General management
1
800 - Literature & rhetoric
1