TY  - RPRT
TI  - Computer programs for plotting spot-beam coverages from an earth synchronous satellite and earth-station antenna elevation angle contours
AU  - Stagl, T. W.
AU  - Singh, J. P.
PY  - 1972
UR  - https://ntrs.nasa.gov/citations/19730004176
ID  - 19730004176
ER  -