Classification
576 - Genetics & evolution
900 - History & geography
64
320 - Political science
50
330 - Economics
45
300 - Social sciences
33
000 - Computer science, information & general works
25
700 - The arts; fine & decorative arts
25
333 - Economics of land & energy
22
500 - Natural sciences & mathematics
20
100 - Philosophy & psychology
17
380 - Commerce, communications & transportation
16
600 - Technology
15
610 - Medicine & health
15
140 - Specific philosophical schools
14
620 - Engineering & allied operations
14
580 - Plants (Botany)
12
340 - Law
10
363 - Other social problems & services
10
301 - Sociology & anthropology
6
540 - Chemistry & allied sciences
6
570 - Life sciences; biology
6
800 - Literature & rhetoric
6
370 - Education
5
581 - Specific topics in natural history
5
200 - Religion
4
400 - Language
4
414 - Phonology & phonetics
4
612 - Human physiology
4
616 - Diseases
4
630 - Agriculture & related technologies
4
780 - Music
4
304 - Factors affecting social behavior
3
410 - Linguistics
3
551 - Geology, hydrology & meteorology
3
170 - Ethics
2
297 - Islam, Babism & Bahai Faith
2
361 - Social problems & social welfare in general
2
530 - Physics
2
658 - General management
2
720 - Architecture
2
360 - Social problems & services; associations
1
364 - Criminology
1
615 - Pharmacology & therapeutics
1
920 - Biography, genealogy & insignia
1
973 - United States
1