Classification
330 - Economics
900 - History & geography
300 - Social sciences
20
600 - Technology
20
320 - Political science
17
700 - The arts; fine & decorative arts
17
620 - Engineering & allied operations
15
000 - Computer science, information & general works
14
380 - Commerce, communications & transportation
13
100 - Philosophy & psychology
11
370 - Education
9
400 - Language
9
333 - Economics of land & energy
8
363 - Other social problems & services
8
140 - Specific philosophical schools
7
340 - Law
6
410 - Linguistics
6
301 - Sociology & anthropology
5
780 - Music
5
800 - Literature & rhetoric
5
200 - Religion
4
576 - Genetics & evolution
4
658 - General management
4
720 - Architecture
4
500 - Natural sciences & mathematics
3
610 - Medicine & health
3
630 - Agriculture & related technologies
3
770 - Photography, photographs & computer art
3
530 - Physics
2
540 - Chemistry & allied sciences
2
120 - Epistemology, causation & humankind
1
170 - Ethics
1
304 - Factors affecting social behavior
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
791 - Public performances
1