Accounts, 1894-1925, of the United States Coast Guard at the Copper Harbor Light Station in Copper Harbor, Michigan. Includes daily expenditures and daily accounts of stores as well as the general account of supplies for Gull Rock Light Station, located off the northern tip of the Keweenaw Peninsula. Also includes an unidentified ship's log.

Records, circa 1850-circa 1900, pertaining to Copper Harbor Light Station in Copper Harbor, Michigan. Includes letters and appointments of lighthouse keepers and lighthouse inspectors for the 11th district which includes Copper Harbor.

Collection, 1904-2005, of Donald L. Nelson, a local maritime historian and former lighthouse keeper and retired member of the U.S. Coast Guard. Includes research files on lighthouses, life saving stations, Coast Guard vessels, and other maritime topics as well as photographs, articles, and books written by Donald Nelson.

Journals, 1895-1930, kept by the lighthouse keepers at the Mendota Lighthouse in Bete Gris, Michigan. Daily entries include lighthouse duties and upkeep, some weather information, housekeeping activities, visitors and trips for provisions.

Correspondence, 1924-1937, between Oliver St. Andre and the Lighthouse Service, later the Bureau of Lighthouses and the War Department Engineer Office. Includes several commendations for St. Andre and his assistant as well a description of a buoy recovery operation after ice had moved the mark off-station.

Correspondence, 1897-1923, from the Light-House Inspector of the Eleventh District to the keeper of the Portage Range Light Station in Jacobsville, Michigan. Includes administrative information, general circulars and notices to mariners.

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.

Manuscript, before 1981, by Dorothy Bennetts Crocker, the daughter of the lighthouse keeper at the Portage Canal Lighthouse north of Houghton, Michigan. Details her early childhood growing up at the lighthouse, circa 1916 to circa 1922.