Black, 1971
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Black, M., 1971: Coccoliths of the Speeton Clay and Sutterby Marl. Yorkshire Geological Society, Proceedings, v.38, p.381-424.
Black, M., 1971: Coccoliths of the Speeton Clay and Sutterby Marl. Yorkshire Geological Society, Proceedings, v.38, p.381-424.