Find a Grave, database and images (https://www.findagrave.com/memorial/93709620/martin-halvorsen: accessed 04 April 2023), memorial page for Martin Halvorsen (1829–1905), Find A Grave: Memorial #93709620, citing Graceland Cemetery, Webster City, Hamilton County, Iowa, USA; Maintained by soulhunter (contributor 47568783).
"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MD2F-RKV : 14 January 2022), Martin Halverson, Webster City, Hamilton, Iowa, United States; citing enumeration district , sheet , NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm .
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