Waller-Joos-Stetzler
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MW1L-37X : accessed 12 Feb 2014), Otto 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-37X : accessed 12 Feb 2014), Otto Shafer in household of Henry Shafer, Moore, Stevens, Minnesota, United States; citing sheet , family 29, NARA microfilm publication T625, FHL microfilm 1820862. Short Title Otto Shafer in household of Henry Shafer, "United States Census, 1920" Source ID S307 Linked to (1) Schaefer, Otto Adolph