Petersen K <br/><br/>
Prehistoric life on earth 
Petersen K 
 -  1963 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>48074 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Economic geology<br/>Geology
<br/><br/><label>Dewey Class. No.: </label>H6, K3