"New York Births and Christenings, 1640-1962", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FDYG-7NB : 20 January 2020), Nathaniel Helligas in entry for Martha Helligas, 1850.
"New York State Census, 1855," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K6SN-PNW : 3 March 2021), Nathaniel Hillegass, St. Johnsville, Montgomery, New York, United States; citing p. 18, line #22, family #167, county clerk offices, New York; FHL microfilm 185,479.
"New York State Census, 1865," database with images, FamilySearch (https://familysearch.org/ark:/61903/3:1:S3HT-6XQ3-BGK?cc=1491284&wc=796F-BR5%3A57529401%2C57529402 : 2 April 2016), Schenectady > Duanesburg, E.D. 01 > image 11 of 23; citing multiple county Clerks; Warren and Lewis County Board of Supervisors; multiple counties in New York; Utica and East Hampton Public Libraries, New York.
"New York State Census, 1875," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VNVM-R1Z : 18 February 2021), Nathaniel Hillegas, Duanesburg, Schenectady, New York, United States; citing p. 2, line 1, State Library, Albany; FHL microfilm 503,209.
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