Classification
100 - Philosophy & psychology
300 - Social sciences
370 - Education
320 - Political science
19
900 - History & geography
17
333 - Economics of land & energy
14
700 - The arts; fine & decorative arts
14
140 - Specific philosophical schools
13
301 - Sociology & anthropology
13
600 - Technology
13
610 - Medicine & health
11
330 - Economics
10
400 - Language
9
620 - Engineering & allied operations
7
170 - Ethics
6
380 - Commerce, communications & transportation
6
340 - Law
5
410 - Linguistics
5
500 - Natural sciences & mathematics
5
000 - Computer science, information & general works
4
576 - Genetics & evolution
4
780 - Music
4
200 - Religion
3
304 - Factors affecting social behavior
3
658 - General management
3
363 - Other social problems & services
2
530 - Physics
2
630 - Agriculture & related technologies
2
800 - Literature & rhetoric
2
297 - Islam, Babism & Bahai Faith
1
398 - Folklore
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
720 - Architecture
1
770 - Photography, photographs & computer art
1