Classification
330 - Economics
320 - Political science
215
333 - Economics of land & energy
115
900 - History & geography
111
300 - Social sciences
82
100 - Philosophy & psychology
54
340 - Law
49
363 - Other social problems & services
49
380 - Commerce, communications & transportation
47
700 - The arts; fine & decorative arts
47
600 - Technology
39
140 - Specific philosophical schools
36
630 - Agriculture & related technologies
31
370 - Education
23
361 - Social problems & social welfare in general
21
581 - Specific topics in natural history
21
610 - Medicine & health
21
551 - Geology, hydrology & meteorology
19
170 - Ethics
17
301 - Sociology & anthropology
16
000 - Computer science, information & general works
14
304 - Factors affecting social behavior
14
576 - Genetics & evolution
13
620 - Engineering & allied operations
12
658 - General management
10
350 - Public administration & military science
9
360 - Social problems & services; associations
9
200 - Religion
8
400 - Language
8
500 - Natural sciences & mathematics
8
580 - Plants (Botany)
7
800 - Literature & rhetoric
7
657 - Accounting
5
410 - Linguistics
4
720 - Architecture
4
780 - Music
4
297 - Islam, Babism & Bahai Faith
3
650 - Management & auxiliary services
3
336 - Public finance
2
550 - Earth sciences
2
364 - Criminology
1
540 - Chemistry & allied sciences
1
791 - Public performances
1