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Subject Phosphates Remove constraint Subject: Phosphates

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    • 1930s

    Two views of the experimental blast furnace on a burden (a load, especially a heavy one) of phosphate at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory plant.

    The Fixed Nitrogen Research…

    • 1930s

    Three views of the experimental blast furnace on a burden (a load, especially a heavy one) of phosphate at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory plant.

    The Fixed Nitrogen Research…

    • 1932-Oct-12

    Two views of the No. 2 experimental blast furnace on a burden (a load, especially a heavy one) of phosphate at a U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory plant.

    The Fixed Nitrogen Research…

    • 1932-Oct-12

    General view of the No. 2 experimental blast furnace on a burden (a load, especially a heavy one) of phosphate at a U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory plant.

    The Fixed Nitrogen Research…