"United States Census, 1880," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:MH8H-S3H : 11 August 2016), William Willis in household of Henry Johnson, Beaver Head Valley, Madison, Montana, United States; citing enumeration district ED 28, sheet 364B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0742; FHL microfilm 1,254,742.
"United States Census, 1900," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:MM5C-Z7Y : 20 January 2015), William F Willis, Brandon Township Sheridan town (part of), Madison, Montana, United States; citing sheet 4B, family 90, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,913.
"Montana, County Marriages, 1865-1950," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:F331-J1X : 7 December 2014), William F. Williss and Inez Galahan, 04 May 1909; citing Marriage, Sheridan, Madison, Montana, county courthouses, Montana; FHL microfilm 1,905,613.
"United States Census, 1910," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:MLCH-GR6 : 29 October 2015), William F Willis, Sheridan, Madison, Montana, United States; citing enumeration district (ED) ED 49, sheet 7A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,847.
"United States Census, 1920," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:M83Y-4RY : 14 December 2015), William F Willis, Brandon, Madison, Montana, United States; citing sheet 7A, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,972.
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