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IBN 0167/88 - NATIONAL CONGRESS OF CHEMISTRY (21st - 24th of September 1988) |
Postal stationery variety: on vellum paper - "23" SEPTEMBRIE instead of "24", |
verso missing code. Five pieces in the world, with this variety. |
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IBN 083/89, 1864 - 1989 Bucharest University |
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IBN 082/89, 1864 - 1989 Bucharest University |
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