[American Institute of Aeronautics and Astronautics International Conference on the Environmental Impact of Aerospace Operations in the High Atmosphere - Denver,CO,U.S.A. (11 June 1973 - 13 June 1973)] International Conference on the Environmental Impact of Aerospace Operations in the High Atmosphere - A three-dimensional stratospheric point-source tracer experiment andits implications for dispersion of effluent from a fleet of supersonic aircraft