Classification
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
700 - The arts; fine & decorative arts
900 - History & geography
600 - Technology
20
333 - Economics of land & energy
17
620 - Engineering & allied operations
17
000 - Computer science, information & general works
11
140 - Specific philosophical schools
9
320 - Political science
9
370 - Education
9
720 - Architecture
9
551 - Geology, hydrology & meteorology
6
610 - Medicine & health
6
300 - Social sciences
3
580 - Plants (Botany)
3
581 - Specific topics in natural history
3
658 - General management
3
200 - Religion
2
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
340 - Law
2
400 - Language
2
800 - Literature & rhetoric
2
297 - Islam, Babism & Bahai Faith
1
414 - Phonology & phonetics
1
530 - Physics
1
550 - Earth sciences
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1