PS - A personal note.
I lived for five years near Springdale, PA, a small town on the Allegheny River near Pittsburgh. Springdale is the location of the Rachel Carson Homestead, the house where she was born and spent her childhood. Today it is maintained as a historical monument and ecological preserve.
My wife is from Springdale. She lived within walking distance of the Homestead when we met.
http://en.wikipedia.org/wiki/Rachel_Carson_Homestead