"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MF8F-1H9 : 12 April 2016), Clara L Calkins in household of Chas P Calkins, Grand Rapids, Kent, Michigan, United States; citing family 228, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"Michigan Marriages, 1822-1995," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FCDC-13K : 4 December 2014), Joseph H. Or C? Herkner and Clara L. Calkins, 13 Jun 1867; citing reference 148; FHL microfilm 926,723.
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHHB-QN9 : 12 April 2016), Clara L Herkner in household of Charles P Calkins, Michigan, United States; citing p. 2, family 12, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,180.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWSK-Z9W : 11 August 2016), Clara L Herkner in household of Joseph C Herkner, Grand Rapids, Kent, Michigan, United States; citing enumeration district ED 138, sheet 306C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0588; FHL microfilm 1,254,588.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSMR-CXS : accessed 12 August 2017), Clara Louease Herk*R in household of Joseph C Herk*R, Precinct 1 Grand Rapids city Ward 3, Kent, Michigan, United States; citing enumeration district (ED) 52, sheet 12B, family 282, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,721.