Classification
000 - Computer science, information & general works
330 - Economics
380 - Commerce, communications & transportation
600 - Technology
333 - Economics of land & energy
30
700 - The arts; fine & decorative arts
28
363 - Other social problems & services
25
620 - Engineering & allied operations
25
900 - History & geography
24
140 - Specific philosophical schools
17
320 - Political science
14
370 - Education
13
610 - Medicine & health
12
576 - Genetics & evolution
10
551 - Geology, hydrology & meteorology
9
658 - General management
8
720 - Architecture
7
300 - Social sciences
6
630 - Agriculture & related technologies
6
340 - Law
5
400 - Language
5
500 - Natural sciences & mathematics
5
580 - Plants (Botany)
4
657 - Accounting
4
410 - Linguistics
3
780 - Music
3
800 - Literature & rhetoric
3
100 - Philosophy & psychology
2
170 - Ethics
2
200 - Religion
2
530 - Physics
2
581 - Specific topics in natural history
2
160 - Logic
1
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
540 - Chemistry & allied sciences
1