The U.S. Coast Survey map calculated the number of slaves in each county in the United States in 1860. Library of Congress In September of 1861, the U.S. Coast Survey published a large map ...

A U.S. EPA report stated that 55% of U.S. rivers are in bad condition. View this beautiful interactive map for inspiration to protect these waterways.

The left panel of a mural containing a relief map of the United States showing the west coast. In lower right, a banner with rolled end containing words "Relief Map / United S_____". Credit Line Gift ...