Robert C. Hayden
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Eight Black American Inventors
Hayden, Robert C.
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Nine Black American Doctors
Hayden, Robert C.
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9 African-American Inventors (Achievers : African Americans in Science and Technology)
Robert C. Hayden
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11 African-American Doctors (Achievers : African Americans in Science and Technology)
Hayden, Torey
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7 African-American Scientists (Achievers : African Americans in Science and Technology)
Hayden, Torey
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