"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MSXS-8W2 : accessed 9 December 2014), Bertha Ackerman in household of Tunis Ackerman, Poughkeepsie Township Poughkeepsie city Ward 6, 2, Dutchess, New York, United States; citing sheet 15B, family 367, NARA microfilm publication T623, National Archives and Records Administration, Washington, D.C.; FHL microfilm 1,241,023.
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MVST-4JM : accessed 9 December 2014), Bertha M Ackerman in household of Tunis Ackerman, New Paltz, Ulster, New York, United States; citing sheet 5A, family 108, NARA microfilm publication T625, National Archives and Records Administration, Washington D.C.; FHL microfilm 1,821,271.
"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K31P-GXQ : accessed 9 December 2014), Bertha M Ackerman in household of Tunis Ackerman, New Paltz Town, Ulster, New York, United States; citing enumeration district (ED) 56-56, sheet 9B, family 145, NARA digital publication of T627, roll 2795, NARA digital publication of T627, National Archives and Records Administration, Washington, D.C.
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