"Ohio, County Marriages, 1789-2013," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XDGZ-TLZ : accessed 22 April 2016), Abner I. Hetrick and Ida C. Gahn, 17 Apr 1907; citing Ottawa, Ohio, United States, reference VOL 2 PAGE 227; county courthouses, Ohio; FHL microfilm 475,914.
Find A Grave, database and images (https://www.findagrave.com : accessed 25 May 2018), memorial page for Mary Catherine Crowell Hetrick (14 May 1845–4 Jun 1924), Find A Grave Memorial no. 63184644, citing Faith Lutheran Cemetery, Lindsey, Sandusky County, Ohio, USA ; Maintained by Wayne Dreier (contributor 47243484) .
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