"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MXJK-69X : 15 September 2017), Benj Kalkhoff in household of Otto Kalkhoff, Carrollton, Greene, Illinois, United States; citing enumeration district ED 85, sheet 142B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0209; FHL microfilm 1,254,209.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M35L-PX2 : accessed 14 July 2018), Benjamin Kalkhoff in household of Otto Kalkhoff, Austin city Ward 7, Travis, Texas, United States; citing enumeration district (ED) 93, sheet 11A, family 236, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,673.
"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KZDL-WP7 : 13 March 2018), Benj Kalkhoff, 1917-1918; citing Okmulgee County, Oklahoma, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,852,063.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MDFK-MWR : accessed 14 July 2018), Ben Kalkhoff, Fort Smith Ward 4, Sebastian, Arkansas, United States; citing ED 160, sheet 9A, line 47, family 212, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 82; FHL microfilm 1,820,082.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XC4T-D4B : accessed 14 July 2018), Ben Kalkhoff, Tulsa, Tulsa, Oklahoma, United States; citing enumeration district (ED) ED 147, sheet 2A, line 79, family 38, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1936; FHL microfilm 2,341,670.
"Texas Deaths, 1890-1976," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K3MJ-7QG : 13 March 2018), Benjamin Kalkhoff, 14 Dec 1939; citing certificate number 53896, State Registrar Office, Austin; FHL microfilm 2,118,412.
"Find A Grave Index," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/QV2S-FSS8 : 13 December 2015), Benjamin Kalkhoff, 1939; Burial, San Antonio, Bexar, Texas, United States of America, San Jose Burial Park; citing record ID 52784236, Find a Grave, http://www.findagrave.com.
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