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| Chicago Union Giants |
| W. S. Peters Booking Letter
(1915) |
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| East St. Louis Giants |
| G.T. Kyle Letter
(1915) |
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| Cuban Stars |
| Alejandro Pompez Letter
(c. 1920’s) |
| more... |
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| Kansas City Monarchs |
| Thomas Y. Baird Letter (1933) |
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| Boston Royal Giants |
| Burlin White Letter
(1935) |
| more... |
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| Negro American League |
| Dr. J. B. Martin Letter
(1944) |
| more... |
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| Indianapolis Clowns – Havana La Palomas |
| Syd Pollock letter
(1946) |
| more... |
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| A.M. Saperstein Sports Enterprises |
| M. Linehan Letter
(1950) |
| more... |
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