"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXMV-8DY : accessed 24 December 2015), Martha Kreiss in household of Alfred Kreiss, Philadelphia Ward 25, Philadelphia, Pennsylvania, United States; citing sheet 9B, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,821,628
"United States Census, 1930", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHW8-J3C : accessed 24 December 2015), Martha Kreiss in entry for Henry C Kreiss, 1930.
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