[James Hutton's] Theory of the earth, 1788 ; [James Hutton's] Observations on granite, 1794 : together with Playfair's biography of Hutton / [James Hutton] ; introduction by Victor A. Eyles ; foreword by George W. White. -- Hafner Press, 1973, c1970. -- (Contributions to the history of geology ; v. 5).