Classification
363 - Other social problems & services
330 - Economics
273
333 - Economics of land & energy
145
320 - Political science
88
600 - Technology
35
380 - Commerce, communications & transportation
33
700 - The arts; fine & decorative arts
26
610 - Medicine & health
23
000 - Computer science, information & general works
21
630 - Agriculture & related technologies
20
620 - Engineering & allied operations
17
140 - Specific philosophical schools
15
304 - Factors affecting social behavior
15
300 - Social sciences
14
551 - Geology, hydrology & meteorology
13
900 - History & geography
11
336 - Public finance
10
301 - Sociology & anthropology
7
100 - Philosophy & psychology
6
581 - Specific topics in natural history
6
340 - Law
5
370 - Education
5
580 - Plants (Botany)
5
200 - Religion
4
576 - Genetics & evolution
4
658 - General management
4
332 - Financial economics
3
350 - Public administration & military science
3
500 - Natural sciences & mathematics
3
540 - Chemistry & allied sciences
3
170 - Ethics
2
400 - Language
2
657 - Accounting
2
720 - Architecture
2
800 - Literature & rhetoric
2
120 - Epistemology, causation & humankind
1
297 - Islam, Babism & Bahai Faith
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1
414 - Phonology & phonetics
1
520 - Astronomy & allied sciences
1
530 - Physics
1
550 - Earth sciences
1