Villegas,Arturo N. <br/><br/>Integrated science with emphasis on earth science Arturo N. Villegas  - MarikinaCity:  Academe Publishing House;  [19994]  - x 607 pages:  with Illustration;  23 cm. <br/><br/>Include Index <br/><br/><label>ISBN: </label>9716840357 <br/><br/><label>LC Class. No.: </label>Q 161  / .I61113 1994