Project 632: A. A. Klymiuk, R. A. Stockey. 2012. A Lower Cretaceous (Valanginian) seed cone provides the earliest fossil record for Picea (Pinaceae). American Journal of Botany. 99 (6):1069-1082.
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A. A. Klymiuk, R. A. Stockey. 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.