Stamps of United States, 4 May 2005
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postage
2005, May 4 American Scientists issue unwmk (no perf info)
| X | 37 | multi | Barbara McClintock | — | — | |
| X | 37 | multi | Josiah Willard Gibbs | — | — | |
| X | 37 | multi | John von Neumann | — | — | |
| X | 37 | multi | Richard Feynman | — | — |
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