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- [S1225] Margaret Jane Dunnihoo, Two Brothers in the Pennsylvania Triangle, (Erie, Pennsylvania: self published, 1974.).
- [S496] Hecker, Henry F. (I396): 1900 US Census, (www.ancestry.com (2004): National Archives and Records Administration micropublication T623, roll 1399, enumeration district (ED) 14, sheet 8B, page 167B, line 96, dwelling 184, family 185; image accessed 1/2/2009.), 1900.PA.Crawford.Cussewago.14.16.
- [S497] Hecker, Henry F. (I396): 1910 US Census, (www.ancestry.com (2006): National Archives and Records Administration micropublication T624, roll 1332, enumeration district (ED) 10, sheet 6A, page 280A, line 25, dwelling 148, family 151; image accessed 1/2/2009.), 1910.PA.Crawford.Cussewago.10.1.
- [S498] Donahue, John E. (I23420): 1920 US Census, (www.ancestry.com (2005): National Archives and Records Administration micropublication T625, roll 1555, enumeration district (ED) 20, sheet 11A, page 188A, line 40, dwelling 284, family 287; image accessed 12/28/2008.), 1920.PA.Crawford.Hayfield.20.21.
- [S1715] Hecker, Henry F. (I396): 1930 US Census, (www.ancestry.com (2002): National Archives and Records Administration micropublication T626, roll 2035; enumeration district (ED) 1, sheet 9B, page 93B, line 63, dwelling 238, family 238; image accessed 4/17/2009.), 1930.ST.CO.TWP.ED.#.
- [S1225] Margaret Jane Dunnihoo, Two Brothers in the Pennsylvania Triangle, (Erie, Pennsylvania: self published, 1974.), p. 39.
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