"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MZ6N-61V : 14 January 2022), Clinton Gilbert in household of John A. Gilbert, New York City, New York County, New York, United States; citing enumeration district , sheet , NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm