Classification
900 - History & geography
229
700 - The arts; fine & decorative arts
90
800 - Literature & rhetoric
87
300 - Social sciences
72
370 - Education
65
140 - Specific philosophical schools
61
320 - Political science
53
100 - Philosophy & psychology
51
720 - Architecture
50
330 - Economics
40
410 - Linguistics
37
000 - Computer science, information & general works
34
340 - Law
25
600 - Technology
25
380 - Commerce, communications & transportation
24
400 - Language
24
333 - Economics of land & energy
23
363 - Other social problems & services
23
610 - Medicine & health
17
301 - Sociology & anthropology
16
500 - Natural sciences & mathematics
16
620 - Engineering & allied operations
14
780 - Music
13
304 - Factors affecting social behavior
12
200 - Religion
11
551 - Geology, hydrology & meteorology
11
576 - Genetics & evolution
10
530 - Physics
7
170 - Ethics
6
361 - Social problems & social welfare in general
6
621 - Applied physics
6
360 - Social problems & services; associations
4
540 - Chemistry & allied sciences
4
770 - Photography, photographs & computer art
4
581 - Specific topics in natural history
3
296 - Judaism
2
297 - Islam, Babism & Bahai Faith
2
414 - Phonology & phonetics
2
615 - Pharmacology & therapeutics
2
630 - Agriculture & related technologies
2
004 - Data processing & computer science
1
120 - Epistemology, causation & humankind
1
336 - Public finance
1
342 - Constitutional & administrative law
1
350 - Public administration & military science
1
364 - Criminology
1
398 - Folklore
1
520 - Astronomy & allied sciences
1
550 - Earth sciences
1
580 - Plants (Botany)
1
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