Ryan, Peter,  1939- <br/><br/>
Journey to the planets / 
by Peter Ryan ; with colour illustrations by Ludek Pesek 
 - Harmondsworth :  Penguin Books,  1972 
 - 48 p. :  ill. ;  21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Planets