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Reason
A fascinating woman who had a strong positive influence in Congress, was one of the trailblazing women of the second wave of African Americans in Congress (and the first wave of African-American women), and has a sharp portrait with good lighting and sharpness. I haven't found the exact source (even after contacting the Library of Congress), but the proximate source is
https://www.gpo.gov/fdsys/pkg/GPO-CDOC-108hdoc224/pdf/GPO-CDOC-108hdoc224.pdf - page 453 as numbered in the document; 461 as automatically numbered by the PDF.