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- [S1921] Hecker, Emmett E. (I20602): 1920 US Census, (www.ancestry.com (2005): National Archives and Records Administration micropublication T625, roll 1567; enumeration district (ED) 145, sheet 5B, page 239, line 81, dwelling 20, family 20; image accessed 4/17/2009.), 1920.PA.Erie.Washington.145.10.
- [S1922] Hecker, Emmett E. (I20602): 1930 US Census, (www.ancestry.com (2002): National Archives and Records Administration micropublication T626, roll 2038; enumeration district (ED) 142, sheet 12A, page 201, line 16, family 227; image accessed 4/17/2009.), 1930.PA.Erie.Washington.142.23.
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