Robert Addy is regarded as one of the greatest pre-league and early league players. Albert G. Spalding credits him with inventing the slide, and later in life he experimented with a version of baseball played on ice, he even led an short-lived iceball team based out of Hartford. The best citation for this is New York Times, although it's a throw-away mention (also see wikipedia's entry for Bob Addy). You can also visit Addy on Find-A-Grave.
More Proto-Baseball photos are available from the New York Public Library, part of their A.G. Spalding collection.










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