Classification
140 - Specific philosophical schools
580 - Plants (Botany)
610 - Medicine & health
630 - Agriculture & related technologies
333 - Economics of land & energy
6
363 - Other social problems & services
5
330 - Economics
4
600 - Technology
4
620 - Engineering & allied operations
4
700 - The arts; fine & decorative arts
4
380 - Commerce, communications & transportation
3
581 - Specific topics in natural history
3
900 - History & geography
3
000 - Computer science, information & general works
2
170 - Ethics
2
300 - Social sciences
2
340 - Law
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
658 - General management
2
720 - Architecture
2
800 - Literature & rhetoric
2
297 - Islam, Babism & Bahai Faith
1
320 - Political science
1
370 - Education
1
612 - Human physiology
1