Lyell, Charles, Principles of Geology, complete in 2 volumes, 1837, First American edition, from the fifth and last London edition, published in Philadelphia and Pittsburgh by James Kay, Jun. and Brother, hardcover, 8vos., rebound in 20th century buckram, 546, 553 pp., original publisher's ad for this set bound-in at the front of volume 1, illustrated throughout, including fold-out plates, hand-colored maps, full page plates and in-text figures.