Inventions and discoveries:  economics/  -- Chicago:  World Book, Inc.,  2009. <br/> col.: ill.;  27. <br/><br/> Includes index. <br/><br/><label>ISBN: </label>9780716603924 <br/><br/><label>Subjects--Topical Terms: </label><br/>Economics--Juvenile literature.<br/>Economic history--Juvenile literature.<br/>Inventions--Juvenile literature.<br/><br/><label>Dewey Class. No.: </label>HS Ref 330 E262 2009