Botkin, Daniel B. Discordant harmonies : a new ecology for the twenty-first century / Daniel B. Botkin. - New York : Oxford University Press, 1990 - xii, 241 p. : ill. ; 22 cm. Includes index. Bibliography: p. 203-228. ISBN: 0195054911 Subjects--Topical Terms: Environmental policy.Environmental protection.Nature conservation. Subjects--Index Terms: Bảo tồn thiên nhiên Bảo vệ môi trường Chính sách môi trường LC Class. No.: QH75 / .B67 1990 Dewey Class. No.: 333.7/2