Bardach, John. <br/><br/>
Downstream :  a natural history of the river from its source to the sea / 
John Bardach. 
 - New York :  Grosset & Dunlap,  c1964. 
 - ix, 278 p. :  ill. ;  20 cm. 
 - Grosset universal library .
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Stream ecology--History.<br/>Rivers--History.<br/>Aquatic biology--History.<br/>Natural history.