Classification
900 - History & geography
320 - Political science
161
330 - Economics
140
800 - Literature & rhetoric
77
300 - Social sciences
59
700 - The arts; fine & decorative arts
49
410 - Linguistics
32
100 - Philosophy & psychology
25
340 - Law
23
140 - Specific philosophical schools
17
400 - Language
17
720 - Architecture
17
780 - Music
13
200 - Religion
11
380 - Commerce, communications & transportation
9
576 - Genetics & evolution
9
630 - Agriculture & related technologies
9
000 - Computer science, information & general works
8
370 - Education
8
333 - Economics of land & energy
5
297 - Islam, Babism & Bahai Faith
4
301 - Sociology & anthropology
4
304 - Factors affecting social behavior
4
363 - Other social problems & services
4
610 - Medicine & health
4
500 - Natural sciences & mathematics
3
530 - Physics
3
540 - Chemistry & allied sciences
3
600 - Technology
3
620 - Engineering & allied operations
3
170 - Ethics
2
520 - Astronomy & allied sciences
2
296 - Judaism
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
550 - Earth sciences
1
580 - Plants (Botany)
1