Classification
581 - Specific topics in natural history
630 - Agriculture & related technologies
363 - Other social problems & services
2
551 - Geology, hydrology & meteorology
2
580 - Plants (Botany)
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
330 - Economics
1
333 - Economics of land & energy
1
370 - Education
1
380 - Commerce, communications & transportation
1
576 - Genetics & evolution
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
900 - History & geography
1