Stamps of Bulgaria, 100th Anniversary of the Sofia City Zoo issue
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postage
1988, May 20 100th Anniversary of the Sofia City Zoo issue unwmk p. 12.75
| - | 25st | multi | Lycaon pictus | |||
| - | 30st | multi | Pelecanus onocrotalus | |||
| - | 32st | multi | Bucorvus abyssinicus | |||
| - | 42st | multi | Nyctea scandiaca |
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