Dale, T. Nelson (Thomas Nelson) 1845-1937 creator Hillebrand, W. F. (William Francis) 1853-1925 Eckel, Edwin C. (Edwin Clarence) 1875-1941 Coons, Altha Titsworth. text bibliography dcu Washington Govt. print. off. 1914 monographic eng

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220 p. illus., plates, maps (part fold.) fold. tab., diagrs. 24 cm. by T. Nelson Dale and others [W. F. Hillebrand, E. C. Eckel, A. T. Coons] Many plates printed on both sides of leaves. "The present bulletin is not only a corrected and revised ed. of bulletin 275, but contains also the results of ... recent discoveries and studies." "Bibliography of slate": p. 205-213. Slate QE75 .B9 no. 586 gs 14000783 Library, U.S. Geological Survey 790329 20260227111316.0 gs 14000783