Books

1. The Chesapeake Bay: A Problem-Based Unit
   

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2. The Stubborn Earth: American Agriculturalists on Chinese Soil, 1898-1937
   

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3. Alfred True on agricultural experimentation and research (Three centuries of science in America)
   

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4. Chlorophyll a Fluorescence : A Signature of Photosynthesis (Advances in Photosynthesis and Respiration)
   

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5. Farm Machinery (Picture Library Series)
   

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Books