Gregorio, Herman C. <br/><br/>Teaching elementary school subjects / by Herman C. Gregorio, Potenciano C. Cruz and Cornelia M. Gregorio. --  -- Quezon City :  R.P. Garcia Pub.,  c1965. <br/>xiv, 482 p. ;  22 cm. <br/><br/><label>ISBN: </label>971-1024-43-8 <br/><br/><label>Subjects--Topical Terms: </label><br/>Education, Elementary.<br/>Elementary school teaching -- Philippines.