Classification
330 - Economics
610 - Medicine & health
900 - History & geography
600 - Technology
42
620 - Engineering & allied operations
34
333 - Economics of land & energy
33
320 - Political science
28
700 - The arts; fine & decorative arts
28
363 - Other social problems & services
22
000 - Computer science, information & general works
14
370 - Education
14
140 - Specific philosophical schools
12
380 - Commerce, communications & transportation
12
630 - Agriculture & related technologies
11
300 - Social sciences
9
720 - Architecture
9
551 - Geology, hydrology & meteorology
8
100 - Philosophy & psychology
7
576 - Genetics & evolution
6
580 - Plants (Botany)
6
658 - General management
5
800 - Literature & rhetoric
4
170 - Ethics
3
200 - Religion
3
301 - Sociology & anthropology
3
304 - Factors affecting social behavior
3
340 - Law
3
581 - Specific topics in natural history
3
360 - Social problems & services; associations
2
361 - Social problems & social welfare in general
2
500 - Natural sciences & mathematics
2
530 - Physics
2
550 - Earth sciences
2
780 - Music
2
297 - Islam, Babism & Bahai Faith
1
350 - Public administration & military science
1
540 - Chemistry & allied sciences
1
615 - Pharmacology & therapeutics
1
657 - Accounting
1