The Geology of Mercer County [Second Geological Survey of Pennsylvania: Report of Progress in 1878. QQQ]
Harrisburg, PA: The Board of Commissions, 1880. Hardcover. Brown cloth boards, octavo, 233pp., illustrated in b&w + folded map in pocket at rear. Book has wear to spine ends and corners, gentle rubbing and shelfwear to boards, binding just tender, previous owner's signature to front flyleaf, text clean and unmarked.....