Classification
140 - Specific philosophical schools
330 - Economics
370 - Education
900 - History & geography
333 - Economics of land & energy
8
700 - The arts; fine & decorative arts
7
600 - Technology
6
620 - Engineering & allied operations
6
320 - Political science
5
363 - Other social problems & services
5
300 - Social sciences
4
610 - Medicine & health
4
000 - Computer science, information & general works
3
100 - Philosophy & psychology
3
200 - Religion
3
301 - Sociology & anthropology
3
340 - Law
3
380 - Commerce, communications & transportation
3
551 - Geology, hydrology & meteorology
2
720 - Architecture
2
800 - Literature & rhetoric
2
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
360 - Social problems & services; associations
1
400 - Language
1
410 - Linguistics
1
414 - Phonology & phonetics
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
770 - Photography, photographs & computer art
1