Clarence Howard Clark, Jr. (1862–1916), financier in Philadelphia, Pennsylvania
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Clarence Howard Clark, Sr. (1833–1906), banker, land owner, and developer in Philadelphia, Pennsylvania
He was an avid yachtman who was a member of the Corinthian Yacht Club of Philadelphia; the New York Yacht Club; and the Eastern Yacht Club and the Corinthian, both of Marblehead, Massachusetts.