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