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Issuer: Bulgaria
Issue: Endangered Birds of Bulgaria
Date: 12/1/2023 (2023 sheets)

Block 1 (4, 2 x 2)
1, 1: 0.90l d=Ficedula albicolis
1, 2: 1.35l d=Clamator glandarius
2, 1: 1.90L d=Porzana pusilla
2, 2: 2.70L d=Haematopus ostralegus