"Iowa State Census, 1925," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/QKQ4-VXQ7 : 23 August 2016), Martha Haugen in household of Albert Haugen, Chickasaw, Chickasaw, Iowa, United States; citing Iowa State Historical Department, Des Moines; FHL microfilm 1,429,268.
"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XJCC-VS9 : accessed 24 February 2016), Albert E. Haugen and Martha Oliva Oleson, 30 Mar 1911; citing Jacksonville, Chickasaw, Iowa, United States, county courthouses, Iowa.
"United States Census, 1930", database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XMNG-GHN : accessed 24 February 2016), Martha Haugen in entry for Albert Haugen, 1930.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KMTX-CNS : accessed 24 February 2016), Martha Haugen in household of Albert Haugen, Jacksonville Township, Chickasaw, Iowa, United States; citing enumeration district (ED) 19-13, sheet 5B, family 80, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1147.
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