Classification
370 - Education
380 - Commerce, communications & transportation
700 - The arts; fine & decorative arts
900 - History & geography
600 - Technology
17
333 - Economics of land & energy
16
620 - Engineering & allied operations
13
363 - Other social problems & services
12
330 - Economics
11
000 - Computer science, information & general works
9
320 - Political science
8
720 - Architecture
7
610 - Medicine & health
6
400 - Language
5
140 - Specific philosophical schools
4
340 - Law
4
551 - Geology, hydrology & meteorology
4
100 - Philosophy & psychology
3
300 - Social sciences
3
658 - General management
3
780 - Music
3
200 - Religion
2
500 - Natural sciences & mathematics
2
580 - Plants (Botany)
2
800 - Literature & rhetoric
2
297 - Islam, Babism & Bahai Faith
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
360 - Social problems & services; associations
1
410 - Linguistics
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1