TY - RPRT TI - The NASA-OAST earth-to-orbit propulsion technology program - The action plan AU - Escher, W. J. D. AU - Moses, J. L. AU - Liang, A. D. AU - Stephenson, F. W. PY - 1992 UR - https://ntrs.nasa.gov/citations/19920055973 ID - 19920055973 ER -