Wyckoff, Jerome   <br/><br/>
Secrets of the earth /  
by Jerome Wickaff ; adapted by A. R. Harwey. 
 - London :   P. Hamlyn,   1967. 
 - 177 str. :   barv. ilustr. ;   29 cm. 
<br/><br/>Ilustr. na spojnih listin. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth 
<br/><br/><label>Dewey Class. No.: </label>550  / WYS 1967