Classification
300 - Social sciences
900 - History & geography
261
320 - Political science
253
301 - Sociology & anthropology
162
700 - The arts; fine & decorative arts
84
330 - Economics
82
370 - Education
73
140 - Specific philosophical schools
71
100 - Philosophy & psychology
64
304 - Factors affecting social behavior
54
200 - Religion
47
600 - Technology
46
610 - Medicine & health
45
340 - Law
44
333 - Economics of land & energy
42
380 - Commerce, communications & transportation
36
363 - Other social problems & services
30
800 - Literature & rhetoric
27
361 - Social problems & social welfare in general
21
364 - Criminology
19
350 - Public administration & military science
17
360 - Social problems & services; associations
16
400 - Language
16
620 - Engineering & allied operations
16
170 - Ethics
15
297 - Islam, Babism & Bahai Faith
15
630 - Agriculture & related technologies
15
410 - Linguistics
14
551 - Geology, hydrology & meteorology
10
581 - Specific topics in natural history
9
720 - Architecture
9
000 - Computer science, information & general works
8
780 - Music
6
296 - Judaism
5
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
770 - Photography, photographs & computer art
2
414 - Phonology & phonetics
1
580 - Plants (Botany)
1
920 - Biography, genealogy & insignia
1