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R. marlin 138 slot J Goldstein, M Y Jabbari, and E R G Eckert, “Film-cooling effectiveness with subsonic injection of air, helium, and freon-12 into a supersonic flow of air,” Submitted for presentation at Heat Transfer and Fluid Mechanics Meeting of Naval Postgraduate School, Monterey, California, June 10–12, 1970, and for publication in