Collection search - St. Lawrence River Development. Cornwall dyke and Barnhart Island areas. H.E.P.C., D.O.T., U.S.C.E. & P.A.N.Y.S. Location of borings. The Hydro Electric Power Commission of Ontario, Generation Department. Trcd.: M.T., R.V. Chkd.: M.T. Supv.: E.G. Date: February 26, 1954. Dwg. no.: 160-3-2090. [Revision] Date: April 1/54.... Drwn.: M.T. Chkd: E.G. [cartographic material]

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