TY  - RPRT
TI  - 1981 LTA technology assessment - Past and present
AU  - Ashford, R. L.
AU  - Levitt, B. B.
AU  - Mayer, N. J.
AU  - Vocar, J. M.
AU  - Woodward, D. E.
PY  - 1981
UR  - https://ntrs.nasa.gov/citations/19810057508
ID  - 19810057508
ER  -