The Allegheny River, of western Pennsylvania and New York, flows through a region rich in natural resources and human history. While the river is 320 miles long, the northern watershed district originates in Potter County, Pennsylvania, and joins the Clarion River near Parker, Pennsylvania. Along the Allegheny River: The Northern Watershed showcases over 200 vintage postcards of the river, its landscape, and its people. These captivating images chronicle over 200 years of history, from the French and Indian War to the timber and oil booms of the late 19th and early 20th centuries.