"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MDLR-8DQ : accessed 1 June 2016), Rosilin Jonas in household of Hiram Jonas, Danbury, Woodbury, Iowa, United States; citing enumeration district ED 237, sheet 309A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0370; FHL microfilm 1,254,370.
"Iowa, County Marriages, 1838-1934", database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/QJDS-4WXP : accessed 1 June 2016), Rosalyn Koker in entry for James Wm Jonas and Dora Belle Hoxie, 1893.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M9GM-2RF : accessed 1 June 2016), Rosalind Jonas in household of Hiram T Jonas, Liston Township Danbury town, Woodbury, Iowa, United States; citing sheet 1B, family 20, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,466.
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