Senate executive documents, 90th Congress, 2d session. J. Astronaut assistance and return agreement, message from President of United States transmitting agreement on rescue of astronauts, return of astronauts, and return of objects launched into outer space, signed Apr. 22, 1968, Washington, London, and Moscow on behalf of United States, United Kingdom of Great Britain and Northern Ireland, and Union of Soviet Socialist Republics; July 15, 1968.