The Farm That Won't Wear Out
Cyril G. (Cyril George) Hopkins
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Table of contents
1. Front matter2. 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 Values3. CHAPTER I4. CHAPTER II5. CHAPTER III6. CHAPTER IV