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Subjects
- Camping.[remove]4
- Boats.2
- Canals.1
- Children.1
- Conservation of natural resources -- United States.1
- Dams.1
- Education -- United States.1
- Engineers -- Michigan -- Ann Arbor.1
- Forest fires -- United States.1
- Forestry.1
- Forests and forestry -- United States.1
- Indians of North America.1
- Irrigation.1
- Land use -- United States.1
- Natural resources.1
- Photographers.1
- Sociology.1
- Surveying -- Michigan.1
- Surveying -- Wyoming.1
- Winter.1