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David Kopay
David Marquette Kopay is an American former professional football player who was a running back in the National Football League (NFL). He played college football for the Washington Huskies. In 1975, he became one of the first professional athletes to come out as gay.
Excerpt from Wikipedia, available under CC BY-SA 4.0.
Books

The David Kopay story
2001
ISBN 9781555836382