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| Johnson, D. A. and Knoll, A. H., 1975. Absolute ages of Quaternary radiolarian datum levels in the equatorial Pacific. Quaternary Research, vol. 5, no. 1, 99-110. |
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| Nigrini, C., 1971. Radiolarian zones in the Quaternary of the equatorial Pacific Ocean. The Micropalaeontology of Oceans, Funnell, B. M. and Riedel, W. R. [eds.], Cambridge University Press, Cambridge, UK, 443-461. |
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