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- [S2384] Erie Times Newspaper, (Erie, Pennsylvania), Thursday, July 1, 2004, George E. Fickenworth Obituary.
- [S1415] Helwig, William Harry (I2036) 1910 US Census, (www.ancestry.com (2006): National Archives and Records Administration micropublication T624, roll 1233; enumeration district (ED) 126, sheet 10B, page 100B, line 91, dwelling 91, family 120; image downloaded 1/8/2009.), 1910.OH.Summit.Akron W2.126.10.
- [S1414] Helwig, William Harry (I2036) 1920 US Census, (www.ancestry.com (2005): National Archives and Records Administration micropublication T625, roll 1565; enumeration district (ED) 78, sheet 8A, page 124A, line 30, dwelling 111, family 153; image downloaded 1/8/2009.), 1920.PA.Erie.Erie W2.78.15.
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