African Americans in Science, Math, and Invention - Ray Spangenburg, Diane Moser, Douglas Long - Google Books

https://books.google.de/books?id=XSOZ8kF5ynEC&pg=PA2&lpg=PA2&dq=Harold+Amos+1919&source=bl&ots=HrI1XVo--D&sig=Z3rvFPaieUIAdxV0mL

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