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       Author Spurr, Josiah Edward Full Title Aspen Special. Sheet VIII 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) Publisher United States Geological Survey Author Spurr, Josiah Edward Full Title 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) Publisher United States Geological Survey 
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