Stevenson, John J. (John James) 1841-1924 creator American Philosophical Society text pau Lancaster, Pa New era printing company 1916-1921 1916 monographic eng

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viii, 458 p. 24 cm. by John J. Stevenson. "Reprinted from Proceedings of the American philosophical society, v. 55, 1916; v. 56, 1917; v. 57, 1918; v. 59, 1921." Coal Geology, Stratigraphic Carboniferous TN800 .S6 gs 21000096 DLC 791023 20260227111325.0 gs 21000096