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