"Colorado Statewide Marriage Index, 1853-2006," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KNQX-VM6 : 19 February 2021), John B Memman and Mary Misner, 28 Sep 1904, Douglas, Colorado, United States; citing no. 470, State Archives, Denver; FHL microfilm 1,690,109.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MX2Q-S2K : 19 February 2021), John Memmen in household of H B Memmen, Clayton, Woodford, Illinois, United States; citing enumeration district ED 223, sheet 383B, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,262.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKW5-HRQ : accessed 13 September 2021), John B Mammen, Franktown, Douglas, Colorado, United States; citing enumeration district (ED) ED 16, sheet 5A, family 1, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 114; FHL microfilm 1,374,127.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7WG-S5H : accessed 13 September 2021), John B Newman, East Castle Rock, Douglas, Colorado, United States; citing enumeration district (ED) ED 5, sheet 1B, line 70, family 17, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 232; FHL microfilm 2,339,967.
Find a Grave, database and images (https://www.findagrave.com/memorial/28466404/john-b-memmen : accessed 13 September 2021), memorial page for John B Memmen (4 Sep 1868–13 Nov 1935), Find A Grave: Memorial #28466404, citing Cedar Hill Cemetery, Castle Rock, Douglas County, Colorado, USA ; Maintained by Stephen Connor Schneider (contributor 46790356) .
The Record Journal of Douglas County, 15 Nov 1935, Colorado Historic Newspapers Collection, Colorado State Library, John B Memmen Passes Away
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