Classification
200 - Religion
330 - Economics
320 - Political science
578
900 - History & geography
75
340 - Law
67
370 - Education
59
100 - Philosophy & psychology
33
300 - Social sciences
29
700 - The arts; fine & decorative arts
19
170 - Ethics
18
800 - Literature & rhetoric
17
140 - Specific philosophical schools
15
333 - Economics of land & energy
14
610 - Medicine & health
14
600 - Technology
12
363 - Other social problems & services
10
576 - Genetics & evolution
10
380 - Commerce, communications & transportation
9
304 - Factors affecting social behavior
8
000 - Computer science, information & general works
7
301 - Sociology & anthropology
7
581 - Specific topics in natural history
7
410 - Linguistics
6
630 - Agriculture & related technologies
6
297 - Islam, Babism & Bahai Faith
4
400 - Language
4
551 - Geology, hydrology & meteorology
3
620 - Engineering & allied operations
3
658 - General management
3
296 - Judaism
2
361 - Social problems & social welfare in general
2
530 - Physics
2
326 - Slavery & emancipation
1
360 - Social problems & services; associations
1
364 - Criminology
1
580 - Plants (Botany)
1
650 - Management & auxiliary services
1
720 - Architecture
1
770 - Photography, photographs & computer art
1