TY - RPRT TI - Communications systems technology assessment study. Volume 2: Results AU - Kelley, R. L. AU - Khatri, R. K. AU - Kiesling, J. D. AU - Weiss, J. A. PY - 1977 UR - https://ntrs.nasa.gov/citations/19790004102 ID - 19790004102 ER -