Scientific and Technical Information Office, National Aeronautics and Space Administration; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.]1971.<SC817-14>
Scientific and Technical Information Division, National Aeronautics and Spcae Administration; [for sale by the Superintendent of Documents, U.S. Govt. Print. Off.]1964-67.<629.1388-L898s>