Batubalani, A.M. <br/><br/>World famous astronomers and mathematicians/ A.M. Batubalani.  -- Student edition.  -- Philippines:  Loacan Publishing House,  1999. <br/> 21. <br/><br/><label>ISBN: </label>9716680309 <br/><br/><label>Subjects--Topical Terms: </label><br/>Biography.<br/><br/><label>Dewey Class. No.: </label>HS Cir 925 W893 1999