Hardin, Garrett . Biology: Its Human Implications / Textual Documents Garrett Hardin. - 2nd ed. / - California : W.H. Freeman & Co. , C1952. - xii,720p. : ill ; 22cm . Bib.,Index Subjects--Index Terms: Biology Biology-Human Biology-Human G-Geology Dewey Class. No.: 570 / H 219 B