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       Author Spurr, Josiah Edward Full Title Lenado Special Sheet. Geology Sheet XX . U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. A.H. Thompson, Geographer. F.M Douglas, Topographer in charge. Triangulation by E.M. Douglas. Topography by W.B. Gorse and R.H. Chapman. Surveyed in 1893. 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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