Context of To amend section 5 of the act entitled "An Act Authorizing the Construction, Repair, and Preservation of Certain Public Projects on Rivers and Harbors, and for Other Purposes," approved March 3, 1925, to authorize the payment of a per diem in connection with naval aerial surveys and flight checking of aviation charts. May 13 (calendar day, May 24), 1935. -- Ordered to be printed.