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    • 1950s – circa

    View of chemist George Wieczorek (right) using a Geiger counter to measure ionizing radiation in an unknown substance, likely soil or fertilizer, at an unidentified U.S. Department of Agriculture facility.

    • 1950s – circa

    George Wieczorek (right) and two unidentified chemists handling radioactive material at an U.S. Department of Agriculture facility. The U.S.D.A. commonly used radioactive material for a variety of research and testing,…

    • 1950s – circa

    View of chemist George Wieczorek removing a vessel from a Pereco kiln at an unidentified U.S. Department of Agriculture facility.

    • 1950s – circa

    View of chemist William A. Jackson using a Gieger counter to examine a package at an unidentified U.S. Department of Agriculture facility. The U.S.D.A. commonly used radioactive material for a variety of research and…

    • 1950s – circa

    View of chemist George Wieczorek (right) and an unidentified chemist using a Geiger counter to measure ionizing radiation in an unknown substance at a U.S. Department of Agriculture facility. The U.S.D.A. commonly used…

    • 1950s – circa

    View of chemist George Wieczorek (left) and an unidentified chemist using a Geiger counter to measure ionizing radiation in radioisotopes at an unidentified U.S. Department of Agriculture facility. A box of…

    • 1945

    Photograph of mathematical physicist and physical chemist Richard C. (Chace) Tolman seated in front of a global map. This photograph is believed to have been taken when Tolman was serving as a scientific advisor to…

    • circa 1884

    Portrait of Adolf von Baeyer (1835-1917), recipient of the 1905 Nobel Prize in Chemistry.

    Johann Friedrich Wilhelm Adolf von Baeyer was born on October 31, 1835, in Berlin, Germany. As a student at the University of…