"United States Census, 1930", database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XCM2-FGW : accessed 8 May 2016), Ivan E Ahlgren in entry for Lawrence Drew, 1930.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VB31-53B : accessed 8 May 2016), Avan E Ahlgren in household of Lawrence Drew, Flathead Township, Flathead, Montana, United States; citing enumeration district (ED) 15-13, sheet 11A, family 225, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 2219.
"Montana, County Marriages, 1865-1950," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/F3WP-RD8 : accessed 8 May 2016), Ivan Edward Ahlgren and Marjorie Alberta Hazard, 17 Mar 1946; citing Marriage, Helena, Lewis and Clark, Montana, county courthouses, Montana; FHL microfilm 1,906,507.
"Montana Death Index, 1860-2007," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VHZ9-KSV : accessed 8 May 2016), Ivan Ahlgren, 13 Jan 1992; from "Montana Death Index, 1868-2011," database, Ancestry (http://www.ancestry.com : 2009); citing State of Montana Department of Public Health and Human Services, Office of Vital Statistics, Helena.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/JL2W-2XM : accessed 8 May 2016), Ivan E Ahlgren, 13 Jan 1992; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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