"Illinois, Cook County Deaths, 1871-1998," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2MQ-3K8J : 8 March 2018), E Louis Zeller, 25 Feb 1899; citing Chicago, Cook, Illinois, United States, source reference 21814, record number , Cook County Courthouse, Chicago; FHL microfilm 1,033,066.
Find a Grave, database and images (https://www.findagrave.com/memorial/62862536/louis-e-zeller: accessed 17 August 2023), memorial page for Louis E. Zeller (1863–25 Feb 1899), Find A Grave: Memorial #62862536, citing Saint Boniface Cemetery, Chicago, Cook County, Illinois, USA; Maintained by LN (contributor 46594703).
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