Here are some Public Domain images.

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Frederick Douglass, ca. 1879. Photograph by George K. Warren (d. 1884).
Frederick Douglass, ca. 1879. Photograph by George K. Warren (d. 1884).
Margaret Hamilton standing next to the navigation software that she and her MIT team produced for the Apollo Project.
Margaret Hamilton standing next to the navigation software that she and her MIT team produced for the Apollo Project.
James McDivitt, Ed White, Extravehicular Activity (EVA), Gemini 4 [Spacewalk], 1965, #13
James McDivitt, Ed White, Extravehicular Activity (EVA), Gemini 4 [Spacewalk], 1965, #13