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16.

Aerial Photography: Dakota County, Minnesota, 1970 university-of-minnesota

1970. Dakota County. The 1970 Air Photo (September 11, 1970) of unknown origin was created by scanning enlargements and georeferencing them to their respective location...

46.

Colfax quadrangle, Illinois : 15 minute series university-of-illinois-urbana-champaign

1958. Geological Survey (U.S.). Contour interval 10 feet;"Culture and drainage in part compiled from aerial photographs taken 1956. Topography by planetable surveys 1957.";Relief ...