Robert was born about 1840.
"Michigan Marriages, 1868-1925," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N3VN-PMH : 18 February 2021), Robt Kolbe in entry for Fred E. Holladay and Louise Kolbe, 1 Jan 1909; citing Marriage, Walkerville, Oceana, Michigan, , Citing Secretary of State, Department of Vital Records, Lansing; FHL microfilm 4209121.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLR2-2M1 : accessed 26 March 2022), Robert Kolbe, Colfax, Oceana, Michigan, United States; citing enumeration district (ED) ED 122, sheet 1B, family 15, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 669; FHL microfilm 1,374,682.
"Michigan Marriages, 1822-1995", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FZSD-B6W : 17 January 2020), Robert Kolby in entry for Edwin Sage, 1893.
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