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    • 1970s

    General view of Jeanette Clarke, employee at New York City's Fordham Hospital, using a Perkin-Elmer Model 403 Atomic Absorption Spectrophotometer to measure the lead content in a sample of blood. Per notations…

    • after 1964 – before 1991

    Photograph of Dr. Bettye Washington Greene (1935-1995), believed to be the first African-American female chemist employed to work in a professional position at the Dow Chemical Company.

    Bettye Greene was born on March…