[ERTS mosaic of the United States.]
United States.Soil Conservation Service.
Goddard Space Flight Center.
United States.National Aeronautics and Space Administration.
[Washington, D.C.] : ASCS
1972.
"Earth Resources Technology Satellite-1 (ERTS) imagery 0.8 to 1.1 micrometer band."
"July 23 to October 31, 1972."
Photographic surveys