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 Digital Geologic-GIS Map of Monocacy National Battlefield, Maryland, adapted from a U.S. Geological Survey Open-File Report map by Southworth and Denenny (2006), is composed of GIS data layers...
data.gov
An official website of the GSA's Technology Transformation Services