Lumpkin, Thomas A. <br/><br/>
Azolla as a green manure  use and management in crop production 
Thomas A. Lumpkin and Donald L. Plucknett 
 - Boulder, Colo.  Westview Press  1982 
 - xx, 230 p.  ill. 
 - Westview tropical agriculture series  no. 5 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Green manuring