Classification
330 - Economics
576 - Genetics & evolution
900 - History & geography
320 - Political science
1,302
300 - Social sciences
439
340 - Law
189
700 - The arts; fine & decorative arts
37
600 - Technology
25
620 - Engineering & allied operations
24
333 - Economics of land & energy
18
000 - Computer science, information & general works
14
100 - Philosophy & psychology
12
200 - Religion
10
140 - Specific philosophical schools
8
363 - Other social problems & services
8
380 - Commerce, communications & transportation
8
720 - Architecture
7
610 - Medicine & health
6
800 - Literature & rhetoric
6
630 - Agriculture & related technologies
5
658 - General management
5
370 - Education
4
500 - Natural sciences & mathematics
4
580 - Plants (Botany)
4
301 - Sociology & anthropology
3
304 - Factors affecting social behavior
3
400 - Language
2
530 - Physics
2
540 - Chemistry & allied sciences
2
581 - Specific topics in natural history
2
780 - Music
2
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
343 - Military, tax, trade & industrial law
1
350 - Public administration & military science
1
414 - Phonology & phonetics
1
791 - Public performances
1
920 - Biography, genealogy & insignia
1
973 - United States
1