Sodusta, Miguel T. How to lengthen the useful life of our textbooks/ Miguel T. Sodusta. - Philippines: In the Grade School, Inc., c2010-2011. - v59 n1, pages 6-7: illustrations; 28 cm. ISSN: 2094-8042 Subjects--Topical Terms: Books. Dewey Class. No.: DPer 370.105 M72 June 2010-Mar 2011 v. 59 n. 1-10