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  1. Cutting vetch, June 4, 1919

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    Oregon Experiment Station

  2. Threshing vetch

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    Oregon Experiment Station

  3. Combine harvester, 1929

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    Oregon Experiment Station

  4. Horse drawn equipment, 1944

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    Oregon Experiment Station

  5. Harvesting with horse drawn equipment

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    Oregon Experiment Station

  6. Artichoke digger, 1929

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    Oregon Experiment Station

  7. Harvesting with horse drawn equipment, 1929

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    Oregon Experiment Station

  8. Horse drawn equipment and tractor, 1927

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    Oregon Experiment Station

  9. Harvesting equipment, 1972

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    Dr. J. Ritchie Cowan is pictured.

  10. Harvesting equipment, 1972

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