Stamps of Colombia, 4th Biennial Arts Exhibition, Medellin issue
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1981, May 15 4th Biennial Arts Exhibition, Medellin issue unwmk p. 12
| - | 20p | multi | "Square Abstract" - Omar Rayo | |||
| - | 25p | multi | "Flowers" - Alejandro Obregon | |||
| - | 50p | multi | "Child with Hobby Horse" - Fernando Bote… |
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