1870 US Census:
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCJ2-KM6 : 12 April 2016), Susan M Knowles in household of Asa Knowles, Kansas, United States; citing p. 7, family 45, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,933.
1880 US Census:
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MF5M-Q31 : 29 August 2017), Susan L Knowlis in household of Asa Knowlis, Lane, Greenwood, Kansas, United States; citing enumeration district ED 93, sheet 303A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0382; FHL microfilm 1,254,382.
Mrs. Susan Knowles, wife of Asa Knowles, died at the home of her son-in-law, Richard Osborn, about two miles north of Quincy, Friday night.She was 64 years and 7 months old. Funeral services were held at the home Sunday by Rev. W. S. Howell of Virgil, interment was made in Virgil cemetery. Mrs. Talbot of this city, a step daughter of the deceased, attended the funeral.
Susan L. Knowles was born July 22, 1833 Gibson County Indiana and died near Virgil, Kansas February 20, 1897, age 63 years, 6 months and 28 days old. She leaves a husband, 3 sons and 4 daughters. Funeral services were conducted by Rev. W.S. Howell from the home of J. R. Osborn February 21 The body was laid to rest in the Virgil Cemetery.
The Leader, Virgil, Kansas February 27, 1897
Find A Grave, database and images (https://www.findagrave.com : accessed 10 October 2018), memorial page for Susan Laura Wammick Knowles (22 Jul 1833–20 Feb 1897), Find A Grave Memorial no. 26453923, citing Virgil Cemetery, Virgil, Greenwood County, Kansas, USA ; Maintained by Wonderer (contributor 46980530) .