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- [S2309] Viola Drake Bisbee, compiler, Geneology of The Bisbee Family (I) - Viola Drake Bisbee, (June 2000, Bisbee Family Connection, Decatur, MI), p. 259.
- [S2012] Census Population Schedules.
- [S1713] Mitteer, Donna H. Hecker: Grave Marker, (Evergreen Cemetery, Union City, Erie, PA.).
- [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.
- [S1714] Mitteer, Donna H. Hecker: Obit (Erie), (Erie Dispatch Herald, Monday, January 24, 1955).
- [S1225] Margaret Jane Dunnihoo, Two Brothers in the Pennsylvania Triangle, (Erie, Pennsylvania: self published, 1974.), p. 39.
- [S944] Rockwell, Charles Ernest (I391): 1930 US Census, (www.ancestry.com (2002): National Archives and Records Administration micropublication T626, roll 2036, enumeration district (ED) 69, sheet 11B, page 11B, line 64, dwelling #, family 257; image accessed 1/7/2009.), 1930.PA.Erie.Erie.69.22.
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