"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MXK7-XYL : 13 January 2022), Mabel Nickols in household of Andrew T. Nickols, Unity Township, Piatt, Illinois, United States; citing enumeration district , sheet , NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm .
Kansas County Marriages, 1855-1911, database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q29Q-MQHV : 23 February 2021), L E Porterfield and Mabel L Nichols, 12 Mar 1902; citing Marriage, Sedgwick, Kansas, United States, district clerk, court clerk, county clerk and register offices from various counties; FHL microfilm 2,363,974.