Records, 1849-1966, of the Keweenaw County Clerk's Office in Eagle River, Michigan. Includes indexes and records for births, marriages, and deaths as well as naturalization records for Keweenaw County. Also includes an index and records to land deeds in Keweenaw County and Isle Royale County (from 1875-1897, Isle Royale County was separate from Keweenaw County).

Diary, 1848, of Lydia Reed Smith Douglass. Photocopies of original and typed transcript of the diary describe her first year of marriage to Columbus C. Douglass, including trips to Illinois and Wisconsin to meet her in-laws and her trip to and subsequent life on Isle Royale, Michigan where her husband, then an employee of the Ohio and Isle Royale Mining Company, had moved to open and manage a mine and smelting operation.

Papers, 1911-1979, of the Mihelcic and Reagan families of Houghton County, Michigan.

Papers, circa 1951-circa 1983, of Robert T. Brown, a long-time faculty member of Michigan Technological University in Houghton, Michigan. Includes personal papers and publications as well as information about his role in the formation of the Biological Sciences department in 1962 and his research into various aspects of tree biology and environmental policy.

Logbook, 1939-1945, for the Rock of Ages Lighthouse, a U.S. Coast Guard maintained lighthouse west of Isle Royale in Michigan's Keweenaw County.

Records, 1934-1936, of the steamship S.S. SEMINOLE, a 188-foot steamer constructed for the U. S. Coast Guard and repurposed as a passenger ship in Houghton, Michigan after decommissioning by the Coast Guard. Includes correspondence, financial records, purchase order records, payroll records and passenger ticket stubs as well as other printed ephemera.

Papers, 1962-2014, belonging to Wendel Johnson documenting his research and tenure studying wildlife on Isle Royale, Michigan.