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Aspen Special.  
Aspen Special Sheet. Geology Sheet IX. U...
Aspen Special.
1898
Geologic Atlas
Author
Spurr, Josiah Edward
Full Title
Aspen Special Sheet. Geology Sheet IX. 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. S.F. Emmons, Geologist in charge. Geology by J.E. Spurr. Assistant, G.W. Tower. Julius Bien & Co. Lith. N.Y. (1898)
Publisher
United States Geological Survey
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