George C. Martin No description specified. 1-4 (4 Records) Documents Archaeological Exploration of the Shumla Caves: Report of the George C. Martin Expedition (1933) The Big Bend Basket Maker A New Type of Atlatl from a Cave Shelter on the Rio Grande Near Shumla, Valverde County, Texas Preliminary Archeological Survey of a Portion of the Texas Coast (1927)