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Event table notes
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| Event data |
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| References |
| Books |
| Hilbert, Essays in American Chess History, page 228 |
| Hilbert, Writings in Chess History, page 388 |
| Reichhelm and Shipley, Chess in Philadelphia, page 10 |
| van Winsen, Mackenzie, Mason and Co. I, page 30, 137 |
| Periodicals |
| [PDEB], 26 May 1865 |
| Web |
| Hilbert, John S. [A Player in Search of a Biographer: George Henry Mackenzie] |
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