Hyde, Margaret O. (Margaret Oldroyd), 1917- <br/><br/>
The earth in action 

 - London  Collins  1969 
 - 128p. : ill 
 - International library .
<br/><br/><label>Subjects--Topical Terms: </label><br/>GEOLOGY--STUDY AND TEACHING<br/>EARTH
<br/><br/><label>LC Class. No.: </label>QE 31 Hyd