Tourtelotte Park Special. Sheet XI Topography. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. A.H. Thompson, Geographer. Morris Bien, Topographer in charge. Triangulation by Morris Bien. Topography by F.F. Grove. Surveyed in 1891. Julius Bien & Co. Lith. N.Y. (1898)