00487nam a22001817a 4500003000400000082001800004100002400022245005100046250000600097260004500103300001000148546001200158650001900170650002400189650002700213650005400240650001100294OSt  a631.8bCOL/CO  aCollings, Gilbert H  aCommercial fertilizers:btheir sources and use  a5  aNew yorkbMcgraw-Hill Book Companyc1955  a617p.  aEnglish  aSodium Nitrate  aLiquid  Fertilizers  aOrigin and development  aPrinciples underlying the purchase of fertilizers  aPotash