Ritsema A R <br/><br/>
Ritsema:Upper mantle 

 -  1972 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>44994 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Geophysics<br/>Geology
<br/><br/><label>Dewey Class. No.: </label>H:C, L2