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Klymiuk, A. A. and Stockey, R. A. 2012. A Lower Cretaceous (Valanginian) seed cone provides the earliest fossil record for Picea (Pinaceae). American Journal of Botany. Vol. 99(6), pp. 1069-1082.
Klymiuk, A. A. and Stockey, R. A. 2012. A Lower Cretaceous (Valanginian) seed cone provides the earliest fossil record forPicea(Pinaceae). American Journal of Botany. Vol. 99(6), pp. 1069-1082.