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