An exploration of Durham Cave in 1893 / by Henry C. Mercer.
|Main Author:||Mercer, Henry Chapman, 1856-1930.|
Boston : Ginn, 1897.
Durham Cave (Pa.)
"Reprinted from Publications of the University of Pennsylvania, Vol. VI."
Caption title: An exploration of Durham Cave, Bucks County, Pennsylvania, in 1893.
p. -178 :
ill., maps ;
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