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  • All fields: Three-Row
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    • Caterpillar Fifteen, 1930

    • Farm Equipment; Agriculture; Iowa State University;
    • Image of a Caterpillar Fifteen in second speed listing and planting three rows of corn with a Rock Island Three-Row Lister, Milan, Ill. The photograph was taken in July 1930.
    • J.B. Davidson photographs and other materials, trip to China, 1947-1949

    • Agricultural Engineering; Farm mechanization; Agricultural machinery; Iowa State University; Dept. of Agricultural Engineering; International Harvester Company; Irrigation; Travels; Davidson, J. Brownlee (Jay Brownlee), 1880-1957; VEISHEA;...
    • A collection of Jay Brownlee Davidson's photographs taken during an International Harvester sponsored trip to China from 1947-1949 to introduce agricultural engineering to the Chinese. A pamphlet, "Committee on Agricultural Engineering for China",...

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