Classification
581 - Specific topics in natural history
333 - Economics of land & energy
2
610 - Medicine & health
2
700 - The arts; fine & decorative arts
2
320 - Political science
1
360 - Social problems & services; associations
1
370 - Education
1
580 - Plants (Botany)
1
600 - Technology
1
620 - Engineering & allied operations
1
900 - History & geography
1