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EXPEDITIONS of 1878 and 1079 Cnder the Command of 
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Scale 1 inch lo 4 miles or T253440 
1st. Lieut. Geo. M. Wheeler, Corps of Engineers U. S.Arniv 
Prof. Jolm J. Stevenson, Geological Assistant. 
CRETACEOUS DUATERNAKY IGNEOUS ROCK 
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U. S. ARMY. 
