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    • 1932-Jan-19

    General view of the Engine Room at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. showing assorted machinery and apparatus.

    The Fixed Nitrogen Research Laboratory…

    • 1932-Jan-19

    Two views of the interior of the Engine Room at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory, with both full and partial views of the blowing engines for the experimental blast furnace.

    The…

    • 1930-Mar-21

    General view of the blowing engines for the experimental blast furnace at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. The individual visible in the photograph is…

    • 1932-Jan-19

    Three views of the Engine Room at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. showing assorted machinery and apparatus.

    The Fixed Nitrogen Research Laboratory…