The obverse bears image of powerful buffalo with lowered head. Below, MONARCH OF THE PLAINS; at left edge, 1934; at right edge © / Ruth W Brooks.
The reverse bears large panel of text. At top, THE FIRST DESCRIPTION OF / THE AMERICAN BUFFALO; below, lengthy quote in Spanish; at bottom, © As written in 1542 by (signature) Alvar Nunez Cabeza da Vaca - (RB monogram).
Edge marked with MEDALLIC ART CO. N.Y. / BRONZE.
Ruth Brooks was involved with the "American Bison Monument" project in 1934 and 1935. Her design for the medal's obverse probably reflects that project but I could not find any details. I don't know whether she submitted a design and was not selected or whether she worked on it in some capacity. Your assistance in tracking down more information would be very welcome.
This medal measures 85mm x 60mm and was struck in bronze by the Medallic Art Company of New York.
References: MACo 1934-014