↑ "Illinois, Cook County Deaths, 1871-1998," database, FamilySearch (https://familysearch.org/ark:/61903/1:2:QLMK-18LK : 18 March 2018), Entry for Charle Rudolf Walgreen, 11 Dec 1939; citing Chicago, Cook, Illinois, United States, source reference , record number , Cook County Courthouse, Chicago; FHL microfilm .
↑ Find a Grave, database and images (accessed 15 July 2022), memorial page for Charles Rudolph Walgreen (9 Oct 1873–11 Dec 1939), Find A Grave: Memorial #21026490, citing Oakwood Cemetery, Dixon, Lee County, Illinois, USA ; Maintained by Find a Grave .
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