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The Farm That Won't Wear Out

Chapter I · : What Goes To Make Up Permanent Fertility CHAPTER II: The Nitrogen Problem And Its Economical Solution CHAPTER III: Phosphorus: The Master Key To Permanent Agriculture CHAPTER IV: Permanent Soil Fertility: Its Relation to Profits and Future Values

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CHAPTER I: What Goes To Make Up Permanent Fertility CHAPTER II: The Nitrogen Problem And Its Economical Solution CHAPTER III: Phosphorus: The Master Key To Permanent Agriculture CHAPTER IV: Permanent Soil Fertility: Its Relation to Profits and Future Values

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