Potassium symposium :  12 papers read at the Fourth Congress of the International Potash Institute (4 sessions), Madrid 1958. 

 - Berne :  The Institute,  1958. 
 - 426 p. :  ill. 
<br/><br/> English, German, Spanish & French text. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Potassium fertilizers.<br/>Soils--Potassium content.