Galang, Angelina P. Seven lenses or environmental principles as if adults mattered / Angelina P. Galang [and six others] - Makati City, Philippines: The Bookmark, Inc., c2003. - 154 pages: illustrations; 26 cm. Includes bibliographical references. ISBN: 9715694608 Subjects--Topical Terms: 1. Environmental education.2. Environmental sciences. Dewey Class. No.: Fil. 363.7 Se497 2003