Classification
140 - Specific philosophical schools
333 - Economics of land & energy
580 - Plants (Botany)
900 - History & geography
600 - Technology
9
620 - Engineering & allied operations
9
700 - The arts; fine & decorative arts
7
363 - Other social problems & services
6
610 - Medicine & health
6
630 - Agriculture & related technologies
4
380 - Commerce, communications & transportation
3
576 - Genetics & evolution
3
000 - Computer science, information & general works
2
170 - Ethics
2
300 - Social sciences
2
330 - Economics
2
340 - Law
2
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
658 - General management
2
720 - Architecture
2
800 - Literature & rhetoric
2
297 - Islam, Babism & Bahai Faith
1
410 - Linguistics
1
530 - Physics
1