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Commemorates the 50th anniversary of the completion of a 9-foot navigational channel on the Ohio River, which was accomplished with the opening of Lock and Dams 52 and 53 in 1929.
On cover: The Beginnings of the Great Expedition ..., the Eastern Legacy, From Trail Blazing to Walking on the Moon. Lists buoys, dams, and other known navigational features along the route the Lewis and Clark Expedition took in 1803.