"Pennsylvania, Philadelphia Marriage Indexes, 1885-1951", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:JV9H-4MD : 2 March 2021), Helen C O'Keefe and Diehl, 1919.
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XH7G-C4V : accessed 19 January 2023), Helen Diehl in household of Clare H Diehl, Philadelphia (Districts 0501-0750), Philadelphia, Pennsylvania, United States; citing enumeration district (ED) ED 660, sheet 16B, line 86, family 328, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2106; FHL microfilm 2,341,840.
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