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Subjects
- Birds.[remove]3
- Agriculture.1
- Automobiles.1
- Children.1
- Conservation of natural resources -- United States.1
- Fishes -- United States.1
- Herpetology.1
- Inventors.1
- Labor movement -- United States -- History -- 19th century.1
- Lakes.1
- Lumber industry.1
- Natural resources.1
- Nematodes.1
- Picnics.1
- Plant diseases.1
- Professors.1
- Research.1
- Rivers.1
- Scientists.1
- Ships.1