Tolop, Editha A. Demonstration lesson in Science and Health VI/ Editha A. Tolop. - Philippines: In the Grade School, Inc., c2010-2011. - v59 n2, pages 70+: illustrations; 28 cm. ISSN: 2094-8042 Subjects--Topical Terms: Programmed instruction--Science and health. Dewey Class. No.: DPer 370.105 M72 June 2010-Mar 2011 v. 59 n. 1-10