Classification
100 - Philosophy & psychology
600 - Technology
900 - History & geography
300 - Social sciences
25
620 - Engineering & allied operations
25
700 - The arts; fine & decorative arts
23
330 - Economics
16
370 - Education
15
320 - Political science
14
610 - Medicine & health
14
140 - Specific philosophical schools
9
333 - Economics of land & energy
9
363 - Other social problems & services
8
380 - Commerce, communications & transportation
7
780 - Music
7
170 - Ethics
6
720 - Architecture
6
000 - Computer science, information & general works
5
340 - Law
5
400 - Language
5
530 - Physics
5
576 - Genetics & evolution
5
120 - Epistemology, causation & humankind
4
301 - Sociology & anthropology
4
410 - Linguistics
4
500 - Natural sciences & mathematics
4
630 - Agriculture & related technologies
4
800 - Literature & rhetoric
4
160 - Logic
2
540 - Chemistry & allied sciences
2
581 - Specific topics in natural history
2
658 - General management
2
770 - Photography, photographs & computer art
2
200 - Religion
1
304 - Factors affecting social behavior
1
350 - Public administration & military science
1
551 - Geology, hydrology & meteorology
1