Classification
330 - Economics
610 - Medicine & health
620 - Engineering & allied operations
36
900 - History & geography
600 - Technology
35
333 - Economics of land & energy
20
700 - The arts; fine & decorative arts
19
363 - Other social problems & services
17
000 - Computer science, information & general works
10
370 - Education
9
140 - Specific philosophical schools
7
380 - Commerce, communications & transportation
7
720 - Architecture
7
320 - Political science
5
630 - Agriculture & related technologies
5
300 - Social sciences
4
551 - Geology, hydrology & meteorology
4
576 - Genetics & evolution
4
580 - Plants (Botany)
4
170 - Ethics
3
800 - Literature & rhetoric
3
100 - Philosophy & psychology
2
297 - Islam, Babism & Bahai Faith
2
301 - Sociology & anthropology
2
500 - Natural sciences & mathematics
2
581 - Specific topics in natural history
2
658 - General management
2
200 - Religion
1
304 - Factors affecting social behavior
1
340 - Law
1
360 - Social problems & services; associations
1
530 - Physics
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
615 - Pharmacology & therapeutics
1
780 - Music
1