TY - RPRT TI - Materials and Processes for New Propulsion Systems with Reduced Environmental Impact AU - Grady, Joseph AU - Robinson, Raymond AU - Roberts, Gary AU - Miller, Sandi AU - Halbig, Michael AU - Pereira, Michael AU - Ruggeri, Charles AU - Kohlman, Lee PY - 2019 UR - https://ntrs.nasa.gov/citations/20190032203 ID - 20190032203 ER -