"Missouri, County Marriage, Naturalization, and Court Records, 1800-1991," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:CZTF-6W2M : 12 August 2020), Mollie P Bilderback in entry for John R Hazlewood, 2 Jan 1879; citing Marriage, Laclede, Missouri, United States, Missouri State Archives, Jefferson City; FHL microfilm 007271616.
"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M66R-1WJ : 14 January 2022), Mary L. Hazelwood in household of John R. Hazelwood, Pilot Grove, Cooper, Missouri, United States; citing enumeration district , sheet , NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm .
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3CM-H1B : accessed 14 January 2022), Mary L Hazelwood in household of John R Hazelwood, Osage Township (west part) Lim Creek village, Camden, Missouri, United States; citing enumeration district (ED) 9, sheet 4B, family 79, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,845.