Inventions and Discoveries Mathematics  -- Chicago  World Book, Inc.  2009 <br/>48 p.:  ill,  27cm <br/><br/> includes index <br/><br/><label>ISBN: </label>9780716603801 <br/><br/><label>Subjects--Topical Terms: </label><br/>Inventions and Discoveries<br/><br/><label>Dewey Class. No.: </label>HS Ref 510 M420 2009