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Isakar, M. (1991). Harjuan (Upper Ordovician) new Bivalves and a new Gastropod from North Estonia. Acta et Commentationes Universitatis Tartuensis. 12: 43-55.
Isakar, M. (1991). Harjuan (Upper Ordovician) new Bivalves and a new Gastropod from North Estonia. Acta et Commentationes Universitatis Tartuensis. 12: 43-55.