Keywords: Mayor John P. Mitchel at Polo Grounds.jpg en w John Purroy Mitchel the w Mayor of New York throwing out the w ceremonial first pitch at the w Opening Day game of the w 1916 New York Giants season at the the Polo Grounds on April 20 1916 Library of Congress Prints and Photographs Division LC-DIG-ggbain-21539 digital file from original negative Bain News Service publisher 1916-04-20 PD-US LOC-image ggbain 21539 PD-Bain John Purroy Mitchel Polo Grounds Politicians with people Ceremonial first pitch 1916 New York Giants season |