Correspondence in Relation to an Interoceanic Canal Between the Atlantic and Pacific Oceans, the Clayton-Bulwer Treaty and the Monroe Doctrine, and the Treaty Between the United States and New Grenada of December 12, 1846: Comprising a Reprint of Senate Ex. Docs. No. 112, 46th Congress, 2d Session; No. 194, 47th Congress, 1st Session; and No. 26, 48th Congress, 1st Session; and Correspondence Not Heretofore Communicated to Congress