Classification
100 - Philosophy & psychology
330 - Economics
700 - The arts; fine & decorative arts
900 - History & geography
20
333 - Economics of land & energy
18
300 - Social sciences
17
320 - Political science
17
600 - Technology
17
363 - Other social problems & services
12
620 - Engineering & allied operations
12
000 - Computer science, information & general works
10
370 - Education
10
610 - Medicine & health
9
140 - Specific philosophical schools
8
200 - Religion
8
780 - Music
8
800 - Literature & rhetoric
8
170 - Ethics
7
400 - Language
6
410 - Linguistics
6
630 - Agriculture & related technologies
6
301 - Sociology & anthropology
5
658 - General management
5
720 - Architecture
5
770 - Photography, photographs & computer art
5
380 - Commerce, communications & transportation
4
530 - Physics
4
340 - Law
3
540 - Chemistry & allied sciences
2
551 - Geology, hydrology & meteorology
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
120 - Epistemology, causation & humankind
1
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
612 - Human physiology
1
791 - Public performances
1