Classification
600 - Technology
658 - General management
700 - The arts; fine & decorative arts
330 - Economics
37
620 - Engineering & allied operations
33
000 - Computer science, information & general works
28
333 - Economics of land & energy
27
900 - History & geography
23
363 - Other social problems & services
20
610 - Medicine & health
18
380 - Commerce, communications & transportation
16
576 - Genetics & evolution
15
580 - Plants (Botany)
13
140 - Specific philosophical schools
11
320 - Political science
10
630 - Agriculture & related technologies
8
370 - Education
6
500 - Natural sciences & mathematics
6
720 - Architecture
6
551 - Geology, hydrology & meteorology
5
800 - Literature & rhetoric
5
340 - Law
4
100 - Philosophy & psychology
3
300 - Social sciences
3
400 - Language
3
540 - Chemistry & allied sciences
3
530 - Physics
2
780 - Music
2
160 - Logic
1
170 - Ethics
1
200 - Religion
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1
414 - Phonology & phonetics
1
581 - Specific topics in natural history
1