Famous Building Stones of our Nation's Capital
Detailed Description
Famous Building Stones of our Nation's Capital, USGS Fact Sheet 2012-3044
Sources/Usage
Public Domain.
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.
