"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXVD-H18 : 15 September 2017), John Schroen in entry for Bernhart Schroen, 1880; citing enumeration district ED 116, sheet 291B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d), roll 0226; FHL microfilm 1,254,226.
"Minnesota, County Marriages, 1860-1949," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2MP-RDFZ : 12 March 2018), John G Schroen and Ruth I Kuntz, 20 Jun 1911, Martin, Minnesota, United States; citing p. 177, local historical societies and universities, Minnesota; FHL microfilm 1,862,277.
"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K87V-D8P : 12 August 2019), John Schroen, 1917-1918; citing Martin County, Minnesota, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,675,519.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWBZ-QP8 : accessed 15 August 2019), John Schran, Jay, Martin, Minnesota, United States; citing ED 123, sheet 11A, line 29, family 93, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 844; FHL microfilm 1,820,844.
"Minnesota Deaths and Burials, 1835-1990," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FD3T-T2P : 8 August 2019), John Schmoen, 21 Jun 1923; citing Martin, Minnesota, reference 1433; FHL microfilm 2,218,088.
Find A Grave, database and images (https://www.findagrave.com : accessed 15 August 2019), memorial page for John Schroen (5 May 1874–21 Jun 1923), Find A Grave Memorial no. 118050173, citing Sherburn Cemetery, Sherburn, Martin County, Minnesota, USA ; Maintained by Jan Dishon (contributor 46540587) .
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