Surveys of the Panama Canal / made under the direction of the Isthmian Canal Commission ; projected from a base line across the isthmus ; made in 1905 and 1906 ; Lieut.-Col. G.W. Goethals, Corps of Engineers, U.S.A., chairman and chief engineer, April 1907 ; drawn by V.N. Sournin, Balboa, C.Z. ; La
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Isthmian Canal Commission (U.S.)
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