Classification
380 - Commerce, communications & transportation
900 - History & geography
30
600 - Technology
28
700 - The arts; fine & decorative arts
28
333 - Economics of land & energy
27
363 - Other social problems & services
25
000 - Computer science, information & general works
22
330 - Economics
22
620 - Engineering & allied operations
21
610 - Medicine & health
12
320 - Political science
11
551 - Geology, hydrology & meteorology
11
658 - General management
8
720 - Architecture
8
370 - Education
7
576 - Genetics & evolution
5
800 - Literature & rhetoric
4
100 - Philosophy & psychology
3
140 - Specific philosophical schools
3
300 - Social sciences
3
304 - Factors affecting social behavior
3
500 - Natural sciences & mathematics
3
540 - Chemistry & allied sciences
3
120 - Epistemology, causation & humankind
2
301 - Sociology & anthropology
2
400 - Language
2
530 - Physics
2
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
340 - Law
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1
414 - Phonology & phonetics
1
657 - Accounting
1
780 - Music
1