The Rhizosphere and plant growth :  papers presented at a symposium held May 8-11, 1989, at the Beltsville Agricultural Research Center (BARC), Beltsville, Maryland / 
editors : Donald L. Keister, Perry B. Cregan. 
 - Dordrecht :  Kluwer Academic Publishers,  1991. 
 - 386 p. :  ill. ;  27 cm. 
<br/><br/><label>ISBN: </label>0792310322 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Rhizosphere--Congresses.<br/>Plant--soil relationships--Congresses.