Classification
320 - Political science
330 - Economics
333 - Economics of land & energy
271
363 - Other social problems & services
95
600 - Technology
85
380 - Commerce, communications & transportation
64
610 - Medicine & health
49
900 - History & geography
41
370 - Education
38
700 - The arts; fine & decorative arts
38
304 - Factors affecting social behavior
34
340 - Law
34
000 - Computer science, information & general works
28
300 - Social sciences
26
630 - Agriculture & related technologies
21
361 - Social problems & social welfare in general
20
360 - Social problems & services; associations
19
140 - Specific philosophical schools
17
551 - Geology, hydrology & meteorology
14
576 - Genetics & evolution
13
620 - Engineering & allied operations
9
658 - General management
7
581 - Specific topics in natural history
5
720 - Architecture
5
800 - Literature & rhetoric
4
100 - Philosophy & psychology
3
170 - Ethics
3
297 - Islam, Babism & Bahai Faith
3
301 - Sociology & anthropology
3
350 - Public administration & military science
3
364 - Criminology
3
580 - Plants (Botany)
3
657 - Accounting
3
200 - Religion
2
410 - Linguistics
2
414 - Phonology & phonetics
2
500 - Natural sciences & mathematics
2
160 - Logic
1
530 - Physics
1
540 - Chemistry & allied sciences
1