Classification
370 - Education
300 - Social sciences
351
100 - Philosophy & psychology
103
900 - History & geography
67
320 - Political science
53
700 - The arts; fine & decorative arts
45
600 - Technology
41
333 - Economics of land & energy
40
610 - Medicine & health
38
140 - Specific philosophical schools
35
330 - Economics
35
340 - Law
32
500 - Natural sciences & mathematics
31
400 - Language
26
301 - Sociology & anthropology
24
304 - Factors affecting social behavior
24
380 - Commerce, communications & transportation
24
000 - Computer science, information & general works
21
620 - Engineering & allied operations
19
363 - Other social problems & services
15
200 - Religion
14
410 - Linguistics
14
170 - Ethics
11
800 - Literature & rhetoric
9
780 - Music
8
530 - Physics
7
576 - Genetics & evolution
7
361 - Social problems & social welfare in general
6
630 - Agriculture & related technologies
6
551 - Geology, hydrology & meteorology
5
581 - Specific topics in natural history
5
120 - Epistemology, causation & humankind
4
297 - Islam, Babism & Bahai Faith
4
360 - Social problems & services; associations
4
364 - Criminology
4
658 - General management
4
720 - Architecture
4
770 - Photography, photographs & computer art
4
540 - Chemistry & allied sciences
3
350 - Public administration & military science
2
371 - Schools & their activities; special education
2
160 - Logic
1
336 - Public finance
1
414 - Phonology & phonetics
1
507 - Education, research & related topics
1
657 - Accounting
1