Stebbins, G. Ledyard (George Ledyard), 1906- Processes of organic evolution / G. Ledyard Stebbins - 3rd ed. - Englewood Cliffs, N.J. Prentice-Hall, 1977 - xii, 269 p. : ill., maps ; 24 cm. Includes indexes ISBN: 0137233957 LCCN: 74-152445 //r84 Subjects--Topical Terms: Evolution