Technology Utilization Office, National Aeronautics and Space Administration; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.]1972 [i.e. 1973]<PD57-15>
Israel Program for Scientific Translations; [available from the U.S. Dept. of Commerce, Clearinghouse for Federal Scientific and Technical Information, Springfield, Va.]1970.<PD57-27>