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1 (of 4) Jacobus H. van 't Hoff. Courtesy: Jacob van 't Hoff Collection, Ms. 74, Special Collections, The Sheridan Libraries, The Johns Hopkins University

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2 (of 4) Jacobus H. van 't Hoff. Courtesy: Jacob van 't Hoff Collection, Ms. 74, Special Collections, The Sheridan Libraries, The Johns Hopkins University

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3 (of 4) Jacobus Henricus van 't Hoff (left) and Wilhelm Ostwald (right) in the laboratory.

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4 (of 4) Jacobus H. van 't Hoff. Litograph. Courtesy: Jacob van 't Hoff Collection, Ms. 74, Special Collections, The Sheridan Libraries, The Johns Hopkins University