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    • Agricultural by-products, 1937

    • Agricultural by-products, 1937

    • Iowa State University; Dept. of Chemical and Biological Engineering; Agricultural wastes

    • A group of large cylinders and tubs containing agricultural by-products are in the foreground. One of the cylinders is empty and waiting to be filled. There are towels hanging over the tubs and there is a large tank sitting on a table in the corner...
    • University Photographs

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