[Tampa, Fla.?] : [Washington, D.C.] : [Springfield, Va.] :; [Tampa, Fla.?] : [Washington, D.C.] : Springfield, Va. : University of South Florida, College Engineering ; [National Aeronautics and Space Administration] ; [National Technical Information Service, distributor],; University of South Florida, College Engineering ; [National Aeronautics and Space Administration] ; National Technical Information Service, distributor, 1987