Classification
380 - Commerce, communications & transportation
600 - Technology
31
900 - History & geography
29
700 - The arts; fine & decorative arts
28
333 - Economics of land & energy
27
363 - Other social problems & services
24
620 - Engineering & allied operations
24
000 - Computer science, information & general works
22
330 - Economics
19
551 - Geology, hydrology & meteorology
11
610 - Medicine & health
11
320 - Political science
9
720 - Architecture
8
370 - Education
6
658 - General management
6
140 - Specific philosophical schools
5
500 - Natural sciences & mathematics
5
576 - Genetics & evolution
5
530 - Physics
4
800 - Literature & rhetoric
4
100 - Philosophy & psychology
3
300 - Social sciences
3
540 - Chemistry & allied sciences
3
120 - Epistemology, causation & humankind
2
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
361 - Social problems & social welfare in general
1
400 - Language
1
410 - Linguistics
1
414 - Phonology & phonetics
1
657 - Accounting
1
780 - Music
1