Scientific and Technical Information Office, National Aeronautics and Space Administration; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.]1973.<MA117-106>
Scientific and Technical Information Division, National Aeronautics and Space Administration; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.]1969 [i.e. 1970]<MA115-24>