Sangatanan, Pedro D.-- <br/><br/>Azolla:  as fertilizer and feed/ Sangatanan, Pedro D.--  -- Metro Manila, Philippines:  Rex Book Store  1984 <br/>iv, 48 p.:  ill,;  23 cm. <br/><br/> includes bibliographical references. <br/><br/><label>Dewey Class. No.: </label>Elem 630 Sa581 1984