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Bulgaria 1989 - WWF. Bats
 |  |
| 3741 | 3742 |
 |  |
| 3743 | 3744 |
Bulgaria 1989 - Centenary of Natural History Museum
 |
| 3778 |
Bulgaria 1989 - European Ecology Congress
 |
| B206A |
 |
| B206B |
Bulgaria 1989 - Snakes
 |  |  |
| 3784 | 3785 | 3786 |
 |  |  |
| 3787 | 3788 | 3789 |
Bulgaria 1989 - Cats
 |  |  |
| 3808 | 3809 | 3810 |
 |  |  |
| 3811 | 3812 | 3813 |
