Ritter International No description specified. 1-2 (2 Records) Documents Archaeological - Historical Resources Assessment of Sec. 21 (T11N R16E), Mid Hills Quadrangle and Sec. 13 (T12N R16E), Lanfair Valley Quadrangle (1977) Yucca Harvesting Near the Hackberry Mountains / Von Trigger Hills, Archaeological Survey and Assessment of Impacts (1978)