World of science:  water, rivers and oceans/  -- Singapore:  Regency publishing group Pty Ltd,  1992. <br/>40 p.:  col. ill.;  24 cm. <br/><br/> includes appendix. <br/><br/><label>ISBN: </label>0858352745 <br/><br/><label>Dewey Class. No.: </label>GR 500 W927 1992