Photo of boxing match, Ad Wolgast vs Mexican Joe Rivers, July 4, 1912 from Leslie's Illustrated Weekly, Volume 115, 1912, page 92. Caption: "A Sport Which Disgraces Civilized Men. Twelve thousand persons witnessing the brutal championship light weight prize fight at Los Angeles, California, between Wolgast and Rivers on July 4th. The contest lasted for thirteen rounds and Wolgast was declared the winner, although Rivers claimed a foul. A great deal of indignation was expressed by opponents of prize fighting because American Independence Day was desecrated by such a spectacle."
Unknown author<span style="display: none;">Unknown author</span>
Leslie's Illustrated Weekly, Volume 115, 1912, page 92