TY - BOOK AU - Philip, TI - Down to earth: speeches and writings of His Royal Highness Prince Philip, Duke of Edinburgh, on the relationship of man with his environment SN - 0828907110 PY - 1989///, c1988 CY - Lexington, Mass., New York, N.Y., U.S.A. PB - Stephen Greene Press, Distributed by Viking Penguin KW - Human ecology KW - Conservation of natural resources KW - Nature KW - Effect of human beings on ER -