Editore: American Journal of Science, vol. 21, 1906, pp. 390-395., 1906
Da: Eryops Books, Stephenville, TX, U.S.A.
Soft cover. Softcovers reprint; minor shelfwear w/ small tear along upper hinge of rear wrap; small tear on paper covering at tail of spine; small nick on fore-edge of rear wrap and last leaf; o/w in good condition.