TY  - RPRT
TI  - The reduction of remote sensing data by visual means
AU  - Colwell, R. N.
AU  - Poulton, C. E.
AU  - Schrumpf, B. J.
PY  - 1980
UR  - https://ntrs.nasa.gov/citations/19800011735
ID  - 19800011735
ER  -