"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSK9-PS1 : accessed 5 January 2021), Catherine Merrill in household of Amos B Merrill, Borough of Manhattan, Election District 30 New York City Ward 21, New York County, New York, United States; citing enumeration district (ED) 550, sheet 7B, family 196, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,106.
"United States Census, 1910," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M53V-3NT : accessed 5 January 2021), Catherine Merrill in household of Augusta Merrill, Manhattan, New York City, New York, United States; citing enumeration district (ED) ED 681, sheet 21B, family 630, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1026; FHL microfilm 1,375,039.
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