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Other| January 01, 1977

Radiometric age of the Monograptus cyphus graptolite zone in southeastern Alaska; an estimate of the age of the Ordovician-Silurian boundary

M. A. Lanphere;

M. A. Lanphere

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M. Churkin;

M. Churkin

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G. D. Eberlein

G. D. Eberlein

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Geological Magazine (1977) 114 (1): 15–24.