Sketch of an escarpment along the Potomac River that exhibits an arched limestone bed.
Featherstonhaugh, G. W.
pictures (two-dimensional representations)
Northern Illinois University
Featherstonhaugh, G. W.A Canoe Voyage Up the Minnay Sotor; with an Account of the Lead and Copper Deposits in Wisconsin; of the Gold Region in the Cherokee Country; and Sketches of Popular Manners; &c. &c. &c. Volume 1.. London: Richard Bentley, 1847.