Satellite power system (SPS) : concept development and evaluation program plan, July 1977 - August 1980 / prepared by National Aeronautics and Space Administration and Dept. of Energy.
- Washington, D.C. : Assistant Secretary for Energy Technology, Division of Solar Technology and Assistant Secretary for Environment ; for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1978.
- Government document
viii, 55p. : ill. ; 28 cm.