Waller-Joos-Stetzler
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MW1L-37D : accessed 12 Feb 2014), Martha Shafer in household of Henry Shafer, Moore, Stevens, Minnesota, United States; citing sheet , family 29, NARA microfilm publication T625, FHL microfilm 1820862.
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Title "United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MW1L-37D : accessed 12 Feb 2014), Martha Shafer in household of Henry Shafer, Moore, Stevens, Minnesota, United States; citing sheet , family 29, NARA microfilm publication T625, FHL microfilm 1820862. Short Title Martha Shafer in household of Henry Shafer, "United States Census, 1920" Source ID S304 Linked to (1) Schaefer, Martha Marie