Marsh George P <br/><br/>
Earth as modified by human action 

 - New York  Scribner Armstrong U S A       1874 
 - xxi, 656p.  cm. 
 - American environmental studies .
<br/><br/> Bib pix-xvii 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Human Geography
<br/><br/><label>Dewey Class. No.: </label>U47, A