Stratigraphic Studies of the Silurian Rocks of Pennsylvania: Part I--Stratigraphic Cross Sections of Lower Devonian and Silurian Rocks in Western Pennsylvania and Adjacent Areas; and Part II--Subsurface Maps of the Silurian Rocks of Western Pennsylvania and Adjacent Areas [Two volume set!]
Harrisburg, PA: Commonwealth of Pennsylvania, 1961 and 1965. Paperback. Two volume set! Printed paper wraps with cloth tape covered stapled binding, folio [13.5" x 18"], illustrated in color and b&w. Volume one: near fine with mild wear to corners, binding tight, text clean and unmarked. Volume two: VG with faint.....