Discovery , Volume 3. 

 - Canada :  Houghton Mifflin Co.,  1992. 
 - 56 pages :  ill. ;  28 cm. 
<br/><br/><label>ISBN: </label>0-395-54386-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Juvenile literature<br/>Dinosaurs--Juvenile literature<br/>Astronomy--Juvenile literature