Palynomorph assemblage biozonation of Paleogene strata in Bende–Umuahia Area, Niger Delta Basin, southeastern Nigeria by Okechukwu Nicodemus Ikegwuonu, Obianuju Patricia Umeji, Osita Igwebuike Chiaghanam, Kingsley K. Nwozor, Otobong Sunday Ndukwe, Kingsley Chukwuebuka Chiadikobi

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