Classification
580 - Plants (Botany)
600 - Technology
9
333 - Economics of land & energy
8
700 - The arts; fine & decorative arts
8
363 - Other social problems & services
7
620 - Engineering & allied operations
7
900 - History & geography
5
610 - Medicine & health
4
140 - Specific philosophical schools
3
576 - Genetics & evolution
3
630 - Agriculture & related technologies
3
170 - Ethics
2
300 - Social sciences
2
304 - Factors affecting social behavior
2
340 - Law
2
380 - Commerce, communications & transportation
2
414 - Phonology & phonetics
2
720 - Architecture
2
800 - Literature & rhetoric
2
297 - Islam, Babism & Bahai Faith
1
330 - Economics
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
658 - General management
1