Collection
- Junius E. Beal Papers, 1869-19461
- Karl Frank Lagler papers, 1941-1970 (majority within 1945-1960)1
- Katherine Moore Cushman Papers, 1950-19701
- Littlefield Family Papers, 1834-19351
- M. Rupert Cutler papers, 1933-1962, 1969-19771
- Michigan Botanical Club Records, 1941-20131
- Michigan Citizens Against Toxic Substances records, 1973-1999 (majority within 1989-1998)1
- Michigan Environmental Council records, 1925-2012 (majority within 1980-2005)1
- Michigan Natural Areas Council Records, 1938-2006 (majority within 1952-1990)1
- Michigan Nature Association records, 1945-2017 (majority within 1961-1999)1
- Michigan United Conservation Clubs records, 1937-20041
- Mill Creek Research Council, inc. records, 1960-19881
- Natural Resources of Michigan Web Archive, 2010-20141
- P.S. Lovejoy Papers, 1918-19411
- Raymond F. Clevenger papers, 1953-19671
- Reginald F. Sharkey papers, 1953-2007 (majority within 1967-1991)1
- School for Environment and Sustainability (University of Michigan) records, 1903 - 20121
- Sierra Club. Michigan Chapter records, 1964-2007 (majority within 1975-2005)1
- West Michigan Environmental Action Council Records, 1968-20121
- William B. Mershon Papers, 1848-19431