"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9BZ-BF8 : accessed 3 November 2021), Dennis Crowley, Precinct 3 Worcester city Ward 4, Worcester, Massachusetts, United States; citing enumeration district (ED) 1743, sheet 1B, family 11, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,696.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M22R-CQ2 : accessed 12 July 2022), Dennis Crowley, Worcester Ward 3, Worcester, Massachusetts, United States; citing enumeration district (ED) ED 1866, sheet 2A, family 31, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 631; FHL microfilm 1,374,644.