"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSL1-MJ5 : accessed 16 July 2020), Marian L Hopper in household of Garrett Hopper, Orangetown Township Nyack village, Rockland, New York, United States; citing enumeration district (ED) 70, sheet 11A, family 238, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,155.
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