Twenty-four Arcas-Robin weather sounding rockets fired within 24 hours by AFPGC at Eglin Air Force Base, Fla.
Bibliography:
17 - Emme, Eugene M, Aeronautics and Astronautics: An American Chronology of Science and Technology in the Exploration of Space 1915-1960, NASA, 1961. HTML when accessed: http://www.hq.nasa.gov/office/pao/History/timeline.html