[BASEBALL]. Group of Four ?Robert A. Wooldridge & Co Natural Guanos? Trade Cards, Including One with an Early Depiction of Baseball. Baltimore, MD: Robert A. Wooldridge & Co., [ca. late 19th- early 20th century]. Color lithograph trade cards with printed text on versos. Each 3 x 4 ??. Some general minor wear (?The Start? card a bit more worn and soiled), versos of cards scuffed with some loss to text. An excellent group. Cards are titled: ?Base Ball at our Picnic,? ?Foot-Ball at our Picnic,? ?The Start,? ?Lawn Tennis at our Picnic.? Rare. From the Mark Rucker Collection.