Crosby, Alfred W. <br/><br/>
The Columbian exchange / 
by Alfred W. Crosby, Jr. ; foreword by Otto von Mering 
 - Paperback ed. 
 - Westport, Conn. :  Greenwood Press,  1973 
 - xv, 268 p. :  ill. ;  22 cm. 
 - Contributions in American studies ;  no.2 .
<br/><br/> Includes index 
<br/><br/>Bibliography (p. 222-260) 
<br/><br/><label>ISBN: </label>0837172284 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Indians--Diseases<br/>Indians--Agriculture<br/>Medical geography--History<br/>Biogeography