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Issuer: Pitcairn Islands
Block in sheet 21623
Date: 4/15/1974 (1974 blocks)
(4, 2 x 2)
1, 1: 4c d=Cerithium sp. and Mitra sp.
1, 2: 10c d=Pyrene sp.
2, 1: 18c d=Cellana sp. and Siphonaria sp.
2, 2: 50c d=Ctena sp.