Keeton, William T. Elements of biological science / William T. Keeton ; ill. Paula DiSanto Bensadoun. - 2nd ed. - New York : Norton, 1973. - xiv, 583 p. : ill. (part. col.) ; 23 cm. Shortened version of the author's Biological science, 2d ed., published in 1972. ISBN: 0393093468 Subjects--Topical Terms: Biology.