CLARK, WILLIAM BULLOCK a. MAYVILLE W. TWITCHELL.

The Mesozoic and Cenozoic Echinodermata of The United States.

Washington, 1915. 4to. Orig. full cloth. Top a. bottom of spine with wear. 341 pp., 107 plates. (Monogr. of the United States Geological Survey).

Order-nr.: 12420