Classification
000 - Computer science, information & general works
330 - Economics
700 - The arts; fine & decorative arts
333 - Economics of land & energy
25
600 - Technology
21
363 - Other social problems & services
13
620 - Engineering & allied operations
13
900 - History & geography
11
576 - Genetics & evolution
10
610 - Medicine & health
10
580 - Plants (Botany)
9
380 - Commerce, communications & transportation
7
140 - Specific philosophical schools
6
500 - Natural sciences & mathematics
5
551 - Geology, hydrology & meteorology
5
630 - Agriculture & related technologies
5
720 - Architecture
5
540 - Chemistry & allied sciences
4
658 - General management
4
320 - Political science
3
340 - Law
3
414 - Phonology & phonetics
3
530 - Physics
3
581 - Specific topics in natural history
3
304 - Factors affecting social behavior
2
400 - Language
2
160 - Logic
1
170 - Ethics
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1
612 - Human physiology
1
800 - Literature & rhetoric
1