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The First Record of Gregoryceras (Ammonoidea, Aspidoceratidae) in the Middle Oxfordian of the Northern Part of Central Russia (Unzha River)

Crossref DOI link: https://doi.org/10.1134/S0031030120010062

Published Online: 2020-03-18

Published Print: 2020-01

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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