Critchlow, K. <br/><br/>
Into the hidden environment :  the ocean / 
Keith Critchlow; illustrated by David Nockels 
 - Canada :  The Macmillan Company of Canada Limited,  1973. 
 - 125 p. ;  ill. :  32 cm. 
<br/><br/>It includes bibliographical information and index. 
<br/><br/><label>ISBN: </label>670400297 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental science<br/>Ocean
<br/><br/><label>Dewey Class. No.: </label>551.46  / CRI