Porter R <br/><br/>
Making of geology 
Porter R 
 -  1977 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>44942 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology
<br/><br/><label>Dewey Class. No.: </label>Hv3.M15<-K60, L7;1