Classification
300 - Social sciences
900 - History & geography
301 - Sociology & anthropology
45
320 - Political science
35
700 - The arts; fine & decorative arts
20
140 - Specific philosophical schools
18
800 - Literature & rhetoric
18
100 - Philosophy & psychology
12
200 - Religion
12
330 - Economics
12
610 - Medicine & health
11
370 - Education
9
333 - Economics of land & energy
8
340 - Law
8
380 - Commerce, communications & transportation
8
600 - Technology
7
304 - Factors affecting social behavior
5
363 - Other social problems & services
5
364 - Criminology
5
400 - Language
5
410 - Linguistics
5
620 - Engineering & allied operations
5
630 - Agriculture & related technologies
5
551 - Geology, hydrology & meteorology
3
297 - Islam, Babism & Bahai Faith
2
398 - Folklore
2
530 - Physics
2
720 - Architecture
2
296 - Judaism
1
350 - Public administration & military science
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
770 - Photography, photographs & computer art
1