Exploring the rivers of North America 

 - Washington, DC  National Geographic Society  1999 
 - 200 p. 
<br/><br/> National Geographic Society, 12/00 
<br/><br/><label>ISBN: </label>0-7922-7846-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>North America--Description and travel<br/>Rivers--North America