Find a Grave, database and images (https://www.findagrave.com/memorial/5210680/john_m-costa: accessed
), memorial page for John M. Costa (24 Jun 1865–19 Dec 1936), Find a Grave Memorial ID 5210680, citing Mount Eden Cemetery, Hayward,
Alameda County,
California,
USA;
Maintained by B.L. Kirby (contributor 47427723).
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