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postage
1981, Aug 10 1300th Anniversary of the First Bulgarian State issue unwmk p. 13.25x13
| - | 55st | multi | Metallurgical Combine Kremikovzi |
airmail
1981, Jun 24 historical aircraft (1981) p. 12.5x12
| - | 55st | multi | Airplane DAR-9 |
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