Classification
300 - Social sciences
333 - Economics of land & energy
320 - Political science
21
700 - The arts; fine & decorative arts
17
000 - Computer science, information & general works
15
330 - Economics
13
363 - Other social problems & services
12
900 - History & geography
12
140 - Specific philosophical schools
10
301 - Sociology & anthropology
10
370 - Education
9
610 - Medicine & health
9
620 - Engineering & allied operations
9
380 - Commerce, communications & transportation
8
600 - Technology
8
500 - Natural sciences & mathematics
7
100 - Philosophy & psychology
6
581 - Specific topics in natural history
6
720 - Architecture
6
551 - Geology, hydrology & meteorology
5
576 - Genetics & evolution
5
540 - Chemistry & allied sciences
4
580 - Plants (Botany)
4
630 - Agriculture & related technologies
4
340 - Law
3
361 - Social problems & social welfare in general
3
414 - Phonology & phonetics
3
612 - Human physiology
3
800 - Literature & rhetoric
3
120 - Epistemology, causation & humankind
2
200 - Religion
2
304 - Factors affecting social behavior
2
360 - Social problems & services; associations
2
400 - Language
2
170 - Ethics
1
364 - Criminology
1
410 - Linguistics
1
530 - Physics
1
658 - General management
1
780 - Music
1