Issues and Opportunities Regarding the U.S. Space Program: A Summary Report of a Workshop on National Space Policy - National Research Council (U.S.). Space Studies Board; Byerly, Radford; Leshner, Richard B.; National Research Council; Whitney, Pamela L.; Aeronautics and Space Engineering Board; Division on Engineering and Physical Sciences; National Academy of Sciences; Space Studies Board; National Research Council (U.S.) (National Academies Press, 2004)