*Pauline D. and R. L. Robertson, ''Cowman's Country: Fifty Frontier Ranches in the Texas Panhandle, 1876-1887'' (Amarillo: Paramount, 1981). | *Pauline D. and R. L. Robertson, ''Cowman's Country: Fifty Frontier Ranches in the Texas Panhandle, 1876-1887'' (Amarillo: Paramount, 1981). |