GRAND CALUMET PHOTO INDEX 1951-1990 (IGS)--
Index to Aerial Photos of the Grand Calumet Area, Northwestern Lake County, Indiana
(Source scale unknown).

Each point represents the approximate location of the center of one of more than 204
aerial photos collected for the northwestern part of Lake County, Indiana, for the
following years: 1951, 1958, 1965, 1980, and 1990.

FGDC Metadata: GRAND_CALUMET_PHOTO_INDEX