Classification
900 - History & geography
37
800 - Literature & rhetoric
26
140 - Specific philosophical schools
21
400 - Language
20
700 - The arts; fine & decorative arts
19
410 - Linguistics
13
300 - Social sciences
12
304 - Factors affecting social behavior
12
370 - Education
12
330 - Economics
11
363 - Other social problems & services
10
100 - Philosophy & psychology
9
320 - Political science
8
340 - Law
8
380 - Commerce, communications & transportation
8
333 - Economics of land & energy
7
720 - Architecture
7
610 - Medicine & health
6
200 - Religion
3
301 - Sociology & anthropology
3
540 - Chemistry & allied sciences
3
551 - Geology, hydrology & meteorology
3
576 - Genetics & evolution
3
580 - Plants (Botany)
3
170 - Ethics
2
297 - Islam, Babism & Bahai Faith
2
361 - Social problems & social welfare in general
2
520 - Astronomy & allied sciences
2
530 - Physics
2
600 - Technology
2
780 - Music
2
000 - Computer science, information & general works
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1