Classification
330 - Economics
320 - Political science
69
333 - Economics of land & energy
23
340 - Law
23
900 - History & geography
17
000 - Computer science, information & general works
16
363 - Other social problems & services
15
600 - Technology
15
700 - The arts; fine & decorative arts
13
380 - Commerce, communications & transportation
11
140 - Specific philosophical schools
10
620 - Engineering & allied operations
10
551 - Geology, hydrology & meteorology
8
576 - Genetics & evolution
8
300 - Social sciences
6
610 - Medicine & health
6
800 - Literature & rhetoric
4
410 - Linguistics
3
580 - Plants (Botany)
3
297 - Islam, Babism & Bahai Faith
2
540 - Chemistry & allied sciences
2
581 - Specific topics in natural history
2
615 - Pharmacology & therapeutics
2
657 - Accounting
2
658 - General management
2
304 - Factors affecting social behavior
1
370 - Education
1
400 - Language
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
530 - Physics
1
630 - Agriculture & related technologies
1
720 - Architecture
1
791 - Public performances
1