Estepa, Flordiliza H. Problem solving proficiency of grade IV learners in Burgos District, Division of La Union / Flordiliza H. Estepa. - City of San Fernando, La Union : [s.n.], 2016. - xiii, 280 pages : colored illustration ; 28 centimeter. Bibliography: pages 219-223. Subjects--Topical Terms: Problem solving. Dewey Class. No.: TH 510.76 Es8p 2016