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SURVEYS WEST ok the 100 T“ MERIDIAN 
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EXPEDITIONS of 1870 and 1879 Under the Command of 
Scale I Inch to 4 miles or 1 : 253440 
4 3 3 1 0 5 10 15 20 
Prof. John J. Stevenson, Geological Assistant. 
CRETACE 0 U S <1IJATERN ARY 
1st. Lieut. Geo. M. Wheeler, Corps of Engineers U. S. Army 
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BY ORDER 
OF 
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Dakota 
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THE HONORABLE THE SECRETARY OF AFAR 
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'UNDER THE DIRECTION OF BRIO. GEE. H. G. WRIGHT, CHIEF OF ENGINEERS 
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U. S. ARMY. 
