Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock ( ) or https://
means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
The downloadable ZIP file contains a georeferenced TIF. This data set is a mosaic of 24 individual DRGs georeferenced to the IDTM83 grid. The original Digital Raster Graphic (DRG) is a raster...
data.gov
An official website of the GSA's Technology Transformation Services