World and regional supply and demand balances for nitrogen, phosphate and potash, 1990/91 - 1996/97 

 - Washington, D.C.  World Bank  1992 
 - xiii, 38p. : ill. 
<br/><br/><label>ISBN: </label>0821321633 
<br/><br/><label>LC Class. No.: </label>IBRD(08)TP