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- [S640] Nelson, Hjalmer (I23871): 1900 US Census, (H. J. NELSON household, 1 Jun 1900, ED110 page 249A, line 44, family 10; NARA micropublication T623, roll 1408; www.ancestry.com (2004): National Archives and Records Administration micropublication T623, roll 1408, enumeration district (ED) 110, sheet 1A, page 249A, line 44, dwelling 10, family 10; image accessed 1/4/2009.), 1900.PA.Erie.Harbor Creek.110.1.
- [S641] Nelson, Hjalmer (I23871): 1910 US Census, (www.ancestry.com (2006): National Archives and Records Administration micropublication T624, roll 1343, enumeration district (ED) 116, sheet 2B, page 211B, line 52, dwelling 37, family 37; image accessed 1/4/2009.), 1910.PA.Erie.Harbor Creek.116.4.
- [S642] Nelson, Hjalmer (I23871): 1920 US Census, (www.ancestry.com (2005): National Archives and Records Administration micropublication T625, roll 1567, enumeration district (ED) 122, sheet 4A, page 150A, line 20, dwelling 82, family 87; image accessed 1/4/2009.), 1920.PA.Erie.Harbor Creek.122.9.
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