Fenton, Carroll Lane, 1900-1969. The stratigraphy and fauna of the Hackberry stage of the Upper Devonian / Carroll Lane Fenton. - New York : London : The Macmillan company; Macmillan & company, limited, 1924. - xi, 260 p. front. (map) illus. xlv pl., double tab., diagrs. 24 cm. Subjects--Topical Terms: GEOLOGIAESTATIGRAFIAPALEONTOLOGIA--Devonian.--Devonian.--Iowa.--Iowa. Universal Decimal Class. No.: 55