Search Results       Your search for [author]Vallestero, Marta Isaac. returned 1 record.           The effectiveness of field trips and audio- visual materials in teaching selected science concepts to first year high school students of the Southern Samar School of Arts and Trades, Guiuab, Eastern Samar SY 1979-1980. by Vallestero, Marta Isaac.; 1980. Subject: Science -- Study and teaching (Secondary) -- Guiuan, Eastern Samar; Outdoor education -- Guiuan, Eastern Samar; Science -- Study and teaching -- Audio-visual aids.          Add to Book Cart Relevance: 29.15%