Classification
320 - Political science
370 - Education
330 - Economics
758
333 - Economics of land & energy
165
300 - Social sciences
132
900 - History & geography
115
700 - The arts; fine & decorative arts
101
610 - Medicine & health
93
304 - Factors affecting social behavior
81
600 - Technology
81
100 - Philosophy & psychology
74
200 - Religion
67
363 - Other social problems & services
61
340 - Law
52
140 - Specific philosophical schools
46
380 - Commerce, communications & transportation
40
000 - Computer science, information & general works
35
400 - Language
35
630 - Agriculture & related technologies
31
170 - Ethics
21
301 - Sociology & anthropology
21
551 - Geology, hydrology & meteorology
20
620 - Engineering & allied operations
16
160 - Logic
13
297 - Islam, Babism & Bahai Faith
13
500 - Natural sciences & mathematics
13
800 - Literature & rhetoric
13
658 - General management
12
410 - Linguistics
11
361 - Social problems & social welfare in general
9
720 - Architecture
8
780 - Music
8
576 - Genetics & evolution
7
581 - Specific topics in natural history
7
336 - Public finance
6
530 - Physics
5
120 - Epistemology, causation & humankind
4
350 - Public administration & military science
4
360 - Social problems & services; associations
4
364 - Criminology
3
540 - Chemistry & allied sciences
3
414 - Phonology & phonetics
2
550 - Earth sciences
2
657 - Accounting
2
770 - Photography, photographs & computer art
2
001 - Knowledge
1
296 - Judaism
1
378 - Higher education
1
580 - Plants (Botany)
1
791 - Public performances
1
more ...