Classification
330 - Economics
576 - Genetics & evolution
320 - Political science
1,364
900 - History & geography
1,331
300 - Social sciences
449
340 - Law
199
700 - The arts; fine & decorative arts
71
000 - Computer science, information & general works
63
600 - Technology
62
333 - Economics of land & energy
59
363 - Other social problems & services
40
380 - Commerce, communications & transportation
35
620 - Engineering & allied operations
34
140 - Specific philosophical schools
25
610 - Medicine & health
17
658 - General management
17
100 - Philosophy & psychology
16
500 - Natural sciences & mathematics
15
800 - Literature & rhetoric
14
720 - Architecture
13
370 - Education
11
580 - Plants (Botany)
11
630 - Agriculture & related technologies
11
200 - Religion
10
304 - Factors affecting social behavior
9
551 - Geology, hydrology & meteorology
9
581 - Specific topics in natural history
8
540 - Chemistry & allied sciences
7
400 - Language
6
530 - Physics
5
301 - Sociology & anthropology
4
410 - Linguistics
4
414 - Phonology & phonetics
4
170 - Ethics
2
297 - Islam, Babism & Bahai Faith
2
350 - Public administration & military science
2
361 - Social problems & social welfare in general
2
657 - Accounting
2
780 - Music
2
160 - Logic
1
343 - Military, tax, trade & industrial law
1
364 - Criminology
1
615 - Pharmacology & therapeutics
1
791 - Public performances
1
920 - Biography, genealogy & insignia
1
973 - United States
1