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- Includes Digital Content✖[remove]16
- Natural Resources of Michigan Web Archive, 2010-2014✖[remove]16
- Bentley Historical Library1
- Bentley Historical Library (collector)1
- East Michigan Environmental Action Council.1
- Ecology Center of Ann Arbor.1
- Environmental Fund (U.S.)1
- Federation for American Immigration Reform.1
- Friends of the Jordan River Watershed.1
- Huron River Watershed Council.1
- Little Traverse Conservancy.1
- Michigan Audubon Society.1
- Ann Arbor (Mich.)1
- Antrim County (Mich.)1
- Charlevoix County (Mich.)1
- East Jordan (Mich.)1
- Great Lakes (North America) -- Environmental conditions.1
- Huron River (Oakland County-Monroe County, Mich.)1
- Huron River Watershed (Oakland County-Monroe County, Mich.)1
- Jordan River Watershed (Antrim County and Charlevoix County, Mich.)1
- United States -- Emigration and immigration.1
- Birds -- Michigan.1
- Birth control.1
- Cities and towns -- Growth -- Michigan.1
- Citizens' associations -- Michigan.1
- Commerce and industry.1
- Conservation of natural resources -- Michigan, Northern.1
- Conservation of natural resources -- Michigan.1
- Conservation projects (Natural resources) -- Michigan, Northern.1
- Ecology -- Michigan.1
- Energy conservation -- Michigan.1