Phosphorus in agriculture: problems of maize production in North-West Portugal: proceedings of the ISMA Symposium held in Braga, Portugal, 23-25 September 1980    (Book) 

 - Paris  ISMA  1980 
 - 85 p.  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Phosphorus in agriculture--Congresses
<br/><br/><label>Universal Decimal Class. No.: </label>633.14/.16 (469) PHO  / 2555