Mississippi River between Cairo, Ill., and Baton Rouge, La., letter submitting report [of Mississippi River Commission] on review of navigation provisions of project for improvement of Mississippi River adopted by act of May 15, 1928, as amended, with view to determining advisability in interest of navigation and flood control of increasing depth of navigable channel from 9 feet to 12 feet between Cairo, Ill., and Baton Rouge, La.

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