Classification
333 - Economics of land & energy
370 - Education
600 - Technology
50
700 - The arts; fine & decorative arts
45
330 - Economics
44
320 - Political science
38
610 - Medicine & health
38
300 - Social sciences
37
363 - Other social problems & services
37
900 - History & geography
33
500 - Natural sciences & mathematics
28
000 - Computer science, information & general works
27
100 - Philosophy & psychology
26
620 - Engineering & allied operations
23
380 - Commerce, communications & transportation
21
140 - Specific philosophical schools
18
400 - Language
16
304 - Factors affecting social behavior
11
551 - Geology, hydrology & meteorology
11
658 - General management
9
581 - Specific topics in natural history
7
630 - Agriculture & related technologies
7
340 - Law
6
580 - Plants (Botany)
6
800 - Literature & rhetoric
6
200 - Religion
5
530 - Physics
5
576 - Genetics & evolution
5
336 - Public finance
4
540 - Chemistry & allied sciences
4
120 - Epistemology, causation & humankind
3
170 - Ethics
3
410 - Linguistics
3
720 - Architecture
3
770 - Photography, photographs & computer art
3
301 - Sociology & anthropology
2
520 - Astronomy & allied sciences
2
657 - Accounting
2
780 - Music
2
297 - Islam, Babism & Bahai Faith
1
361 - Social problems & social welfare in general
1