The oldest surviving aerial photograph was taken on October 13, 1860 by James Wallace Black over the city of Boston.
The Mississippi watershed is the largest drainage basin in North America with an area of 3.2 million square kilometers (1,245,000 square miles). The extent of the watershed reaches 32 U.S. states and two Canadian provinces. The area of the watershed covers 40% of the landmass of the continental United States. The The Mississippi […]