Guzman, Ruth S. , Environmental science : towards a sustainable earth / Ruth S. Guzman, Ruth Marian Guzman-Genuino. - Quezon City : Vibal Group Inc., 2018. - ix, 182 pages : colored illustrations, pictures, figures, tables; 27 cm. English ISBN: 9789710742516 Subjects--Topical Terms: Environmental science. Dewey Class. No.: 628 / G993