Classification
000 - Computer science, information & general works
370 - Education
900 - History & geography
700 - The arts; fine & decorative arts
25
333 - Economics of land & energy
18
600 - Technology
18
620 - Engineering & allied operations
17
363 - Other social problems & services
15
330 - Economics
12
380 - Commerce, communications & transportation
12
320 - Political science
11
140 - Specific philosophical schools
9
400 - Language
9
720 - Architecture
6
410 - Linguistics
5
610 - Medicine & health
5
340 - Law
4
500 - Natural sciences & mathematics
4
551 - Geology, hydrology & meteorology
4
100 - Philosophy & psychology
3
170 - Ethics
3
300 - Social sciences
3
576 - Genetics & evolution
3
800 - Literature & rhetoric
3
200 - Religion
2
304 - Factors affecting social behavior
2
414 - Phonology & phonetics
2
540 - Chemistry & allied sciences
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
770 - Photography, photographs & computer art
2
780 - Music
2
297 - Islam, Babism & Bahai Faith
1
360 - Social problems & services; associations
1
530 - Physics
1
658 - General management
1