TY  - RPRT
TI  - A system of regional agricultural land use mapping tested against small scale Apollo 9 color infrared photography of the Imperial Valley (California)
AU  - Claude W. Johnson
AU  - Leonard W. Browden
AU  - Robert W. Pease
PY  - 1969
DO  - 10.3133/ofr71158
UR  - https://pubs.usgs.gov/publication/ofr71158
ID  - ofr71158
ER  -