Classification
330 - Economics
610 - Medicine & health
900 - History & geography
600 - Technology
43
620 - Engineering & allied operations
36
333 - Economics of land & energy
35
700 - The arts; fine & decorative arts
32
320 - Political science
30
363 - Other social problems & services
25
370 - Education
16
000 - Computer science, information & general works
14
140 - Specific philosophical schools
14
380 - Commerce, communications & transportation
13
300 - Social sciences
12
630 - Agriculture & related technologies
11
720 - Architecture
10
551 - Geology, hydrology & meteorology
9
100 - Philosophy & psychology
7
576 - Genetics & evolution
6
580 - Plants (Botany)
6
301 - Sociology & anthropology
5
340 - Law
5
658 - General management
5
800 - Literature & rhetoric
5
200 - Religion
4
170 - Ethics
3
304 - Factors affecting social behavior
3
581 - Specific topics in natural history
3
297 - Islam, Babism & Bahai Faith
2
360 - Social problems & services; associations
2
361 - Social problems & social welfare in general
2
500 - Natural sciences & mathematics
2
530 - Physics
2
540 - Chemistry & allied sciences
2
550 - Earth sciences
2
780 - Music
2
350 - Public administration & military science
1
615 - Pharmacology & therapeutics
1
657 - Accounting
1