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| The Afro-American - February 27, 1920 |
Gary Ashwill, over at agate type, featured a few articles about the Negro National League's birthday. I found another article that lists the players for each of the six teams.
UPDATE: I found a few more supporting articles.
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| The Tulsa Star - February 14, 1920 |
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| The Tulsa Star - February 28, 1920 |
