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Upper Cretaceous Ammonites from the Calabar Region, South-east Nigeria
P. M. P. ZaborskiMichael Kingsley Howarth
出版British Museum (Natural History), 1985
ISBN05650700619780565070069
URLhttp://books.google.com.hk/books?id=bWPtchYrv60C&hl=&source=gbs_api