Classification
320 - Political science
363 - Other social problems & services
600 - Technology
333 - Economics of land & energy
72
620 - Engineering & allied operations
67
330 - Economics
60
700 - The arts; fine & decorative arts
54
551 - Geology, hydrology & meteorology
40
000 - Computer science, information & general works
37
900 - History & geography
36
380 - Commerce, communications & transportation
30
610 - Medicine & health
24
140 - Specific philosophical schools
22
300 - Social sciences
18
370 - Education
18
630 - Agriculture & related technologies
18
581 - Specific topics in natural history
15
340 - Law
11
576 - Genetics & evolution
11
720 - Architecture
11
580 - Plants (Botany)
10
304 - Factors affecting social behavior
7
658 - General management
7
200 - Religion
6
800 - Literature & rhetoric
6
500 - Natural sciences & mathematics
5
657 - Accounting
5
100 - Philosophy & psychology
4
170 - Ethics
4
361 - Social problems & social welfare in general
4
540 - Chemistry & allied sciences
4
301 - Sociology & anthropology
3
350 - Public administration & military science
3
297 - Islam, Babism & Bahai Faith
2
530 - Physics
2
336 - Public finance
1
360 - Social problems & services; associations
1
400 - Language
1
410 - Linguistics
1
414 - Phonology & phonetics
1
520 - Astronomy & allied sciences
1
612 - Human physiology
1
615 - Pharmacology & therapeutics
1
650 - Management & auxiliary services
1