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1. Use of the exponential yield curve in fertilizer experiments (id:CAT86200342)

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2. Human food from an acre of staple farm products (id:ORC00000242)

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3. Soil conservation (id:ORC00000299)

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4. A successful poultry and dairy farm (id:5420687)

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5. A method of eradicating Johnson grass (id:ORC00000094)

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6. Renovation of worn-out soils (id:ORC00000079)

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7. An example of model farming (id:ORC00000076)

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8. A successful hog and seed-corn farm (id:5420683)