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- [S688] Newspapers.com - Chula Vista Star-News - 14 Aug 1986 - Page 36, (Name: Chula Vista Star-News; Location: Chula Vista, California; Date: 14 Aug 1986;), 14 Aug 1986.
https://www.newspapers.com/clip/19958026/chula_vista_starnews/?xid=637
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https://www.newspapers.com/clip/105792651/ronald-yturralde-obituary/?xid=637
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