Classification
300 - Social sciences
900 - History & geography
252
320 - Political science
242
301 - Sociology & anthropology
153
330 - Economics
96
700 - The arts; fine & decorative arts
83
370 - Education
70
140 - Specific philosophical schools
64
100 - Philosophy & psychology
52
304 - Factors affecting social behavior
52
600 - Technology
45
340 - Law
39
200 - Religion
37
610 - Medicine & health
35
380 - Commerce, communications & transportation
34
363 - Other social problems & services
31
333 - Economics of land & energy
30
800 - Literature & rhetoric
28
361 - Social problems & social welfare in general
19
350 - Public administration & military science
17
297 - Islam, Babism & Bahai Faith
16
364 - Criminology
16
400 - Language
16
620 - Engineering & allied operations
16
360 - Social problems & services; associations
15
630 - Agriculture & related technologies
15
410 - Linguistics
14
170 - Ethics
13
551 - Geology, hydrology & meteorology
11
720 - Architecture
10
000 - Computer science, information & general works
9
581 - Specific topics in natural history
9
780 - Music
6
296 - Judaism
4
500 - Natural sciences & mathematics
4
520 - Astronomy & allied sciences
4
530 - Physics
4
120 - Epistemology, causation & humankind
3
576 - Genetics & evolution
3
398 - Folklore
2
580 - Plants (Botany)
2
770 - Photography, photographs & computer art
2
791 - Public performances
2
414 - Phonology & phonetics
1
920 - Biography, genealogy & insignia
1