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John Gardner Coolidge was born 4 July 1863 in Boston, Suffolk County, Massachusetts, United States to Joseph Randolph Coolidge (1828-1925) and Julia Gardner (1841-1921) and died 28 February 1936 Boston, Suffolk County, Massachusetts, United States of unspecified causes. He married Helen Granger Stevens (1876-1962) 29 April 1909 .
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