Public [act] 518-625, 76th Congress. Pay, Navy. S. 3013, act to amend sec. 5 of act authorizing construction, repair, and preservation of certain public works on rivers and harbors, approved Mar. 3, 1925 (43 Stat. 1190; 34 U. S. C. 893), so as to authorize payment of per diem in connection with naval aerial surveys and flight checking of aviation charts.