"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MCYN-35B : 23 December 2020), Abraham Vanvalkenburgh in household of Peter Vanvalkenburgh, Lexington, Greene, New York, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).
"United States Census, 1860", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MC7Z-BCZ : 18 February 2021), Abram Van Valkenburgh in entry for Peter Van Valkenburgh, 1860.
Find a Grave, database and images (https://www.findagrave.com/memorial/236188401/abram-van_valkenburgh: accessed 16 April 2023), memorial page for Abram Van Valkenburgh (1849–1920), FindAGrave|236188401, citing Town of Catskill Cemetery, Catskill, Greene County, New York, USA; Maintained by Donna J. McClain (contributor 49680240).
David Schorer, firsthand knowledge. Click the Changes tab for the details of edits by David and others.
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