Great Lakes -- St. Lawrence Seaway navigation season extension. Communication from the Assistant Secretary of the Army (Civil Works) transmitting an interim feasibility report by the Corps of Engineers on the extension of the navigation season on the Great Lakes and St. Lawrence Seaway, in partial response to section 107 of Public Law 91-611. September 7, 1979. -- Referred to the Committee on Public Works and Transportation and ordered to be printed. [electronic resource]