Classification
100 - Philosophy & psychology
330 - Economics
361
320 - Political science
228
300 - Social sciences
91
900 - History & geography
79
340 - Law
61
170 - Ethics
56
333 - Economics of land & energy
56
610 - Medicine & health
54
700 - The arts; fine & decorative arts
40
363 - Other social problems & services
34
140 - Specific philosophical schools
33
200 - Religion
31
370 - Education
30
000 - Computer science, information & general works
29
600 - Technology
27
361 - Social problems & social welfare in general
22
301 - Sociology & anthropology
21
500 - Natural sciences & mathematics
21
380 - Commerce, communications & transportation
20
576 - Genetics & evolution
17
336 - Public finance
15
400 - Language
14
581 - Specific topics in natural history
13
620 - Engineering & allied operations
13
630 - Agriculture & related technologies
13
800 - Literature & rhetoric
12
530 - Physics
10
658 - General management
9
120 - Epistemology, causation & humankind
8
410 - Linguistics
8
304 - Factors affecting social behavior
7
551 - Geology, hydrology & meteorology
7
780 - Music
7
657 - Accounting
6
350 - Public administration & military science
5
720 - Architecture
5
580 - Plants (Botany)
4
297 - Islam, Babism & Bahai Faith
3
540 - Chemistry & allied sciences
3
770 - Photography, photographs & computer art
3
360 - Social problems & services; associations
2
612 - Human physiology
2
616 - Diseases
2
160 - Logic
1
306 - Culture & institutions
1
615 - Pharmacology & therapeutics
1
650 - Management & auxiliary services
1
920 - Biography, genealogy & insignia
1