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