Classification
620 - Engineering & allied operations
900 - History & geography
600 - Technology
57
333 - Economics of land & energy
42
700 - The arts; fine & decorative arts
39
330 - Economics
36
000 - Computer science, information & general works
20
363 - Other social problems & services
18
370 - Education
15
380 - Commerce, communications & transportation
14
320 - Political science
12
610 - Medicine & health
12
658 - General management
10
720 - Architecture
9
576 - Genetics & evolution
8
140 - Specific philosophical schools
7
500 - Natural sciences & mathematics
7
300 - Social sciences
5
580 - Plants (Botany)
5
630 - Agriculture & related technologies
5
340 - Law
4
400 - Language
3
551 - Geology, hydrology & meteorology
3
581 - Specific topics in natural history
3
800 - Literature & rhetoric
3
100 - Philosophy & psychology
2
200 - Religion
2
297 - Islam, Babism & Bahai Faith
2
304 - Factors affecting social behavior
2
410 - Linguistics
2
414 - Phonology & phonetics
2
530 - Physics
2
540 - Chemistry & allied sciences
2
301 - Sociology & anthropology
1
657 - Accounting
1
780 - Music
1