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The North American Transportation Atlas Data - 1998 (NORTAD) is a set
of geographic data sets for transportation facilities in Canada, Mexico,
and the United States. These data sets include geospatial information
for transportation modal networks and intermodal terminals, and related
attribute information. Included are descriptions of the file formats and
metadata as prescribed by the Federal Geographic Data Committee (FGDC).
Layers in this dataset are based on combinations of the following options.
You may choose from these options to select a specific layer on the map page.