"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MX6R-W1Z : accessed 14 March 2016), Abram Ludlow in household of George Ludlow, Indiana, United States; citing p. 67, family 496, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,851.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHS7-NSJ : accessed 14 March 2016), Abram Ludlow in household of Sarah Ludlow, Black, Posey, Indiana, United States; citing enumeration district ED 96, sheet 76B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0305; FHL microfilm 1,254,305.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MK56-D8H : accessed 14 March 2016), Abe Ludlow, Black, Posey, Indiana, United States; citing enumeration district (ED) ED 47, sheet 3B, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,388.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9MP-BHH : accessed 14 March 2016), Abe Ludlow, Black Township (west & south part excl. Mt. Vernon city)), Posey, Indiana, United States; citing sheet 3A, family 39, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,398.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:V1YP-W38 : accessed 14 March 2016), Abe Ludlow, Black Township, Posey, Indiana, United States; citing enumeration district (ED) 65-8, sheet 2B, family 39, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1087.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MF47-94H : accessed 14 March 2016), Abe Ludlow, Black, Posey, Indiana, United States; citing sheet 2B, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,458.
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