Sprague, Howard B. <br/><br/>
Grasslands of the United States  : their economic and ecological importance, a symposium of the American Forage... 

 - Ames :  Iowa State University,  1974 
 - 220 p.  : ilus. ; láms. ; mapas 
<br/><br/><label>LCCN: </label>57549 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pastizales--Ecología.<br/>Pastizales--E.U.A.
<br/><br/><label>Dewey Class. No.: </label>633.2  / S6