Washington : NASA : for sale by the Supt. of Docs., U.S. Govt. Print Off., 1977
2v. : ill. ; 26cm
"Symposia sponsored by International Academy of Astronautics and held at Mar del Plata, Argentina, October 10, 1969; Constance, German Federal Republic, October 11-12, 1970; Brussels, Belgium, September 23, 1971; Vienna, Austria, October 13, 1972."