Dear Sir, the annexed copy of a letter from Major General G. K. Warren, engineer in charge of Government works on the Upper Mississippi river, and of a map made by him, will show the emergency that exists for the passage of Senate bill no. 796, now before Congress, appropriating one hundred thousand acres of land in the Sate of Minnesota, to secure the Falls of Saint Anthony and the good navigation immediately above the same, in the Mississippi river ... / respectfully submitted, in behalf of the Minneapolis and St. Anthony Board of Trade