De Soto Exposition Commissioni. Creating United States De Soto Exposition Commission, report to accompany H. R. 9751 [for creation of United States De Soto Exposition Commission, to provide for commemoration of 400th anniversary of discovery of Mississippi River by Hernando De Soto, commemoration of De Soto's Visit to Chickasaw territory in northern Mississippi, and other points covered by his expedition, and 205th anniversary of Battle of Ackia, and for other purposes]; submitted by Mr. Keller.