Stamps of Nigeria, 17 Jul 1992
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postage
1992, Jul 17 25th Anniversary of International Institute of Tropical Agriculture issue wmk. mult crown & script CA p. 14
| - | 50k | multi | Musa paradisiaca | .20 | .20 | |
| - | 1n | multi | Manihot esculenta | — | — | |
| - | 1.50n | multi | Ipomoea batatas | — | — | |
| - | 2n | multi | Yams Harvest | — | — |
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