Treaties and other international acts series. 5992. Space research, measurement of high altitude winds and temperatures, agreement between United States and Spain, effected by exchange of notes signed Washington Apr. 14, 1966, [entered into force Apr. 14, 1966]; with memorandum of understanding between Instituto Nacional de Tecnica Aeroaespacial and United States National Aeronautics and Space Administration, signed Jan. 14, 1966.