"The author has found it impossible to compress into two volumes, according to his original plan, the wide range of subjects which must be discussed ... it will therefore be necessary to extend the 'Principles of Geology' to three volumes"-- v. 2, pref.
Includes bibliographical references and index.
Micro-opaque. New York : Readex Microprint, 1967. 16 cards ; 23 x 15 cm. (Landmarks of science).