Corylus johnsonii (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Corylus johnsonii" in English language version.

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Pigg, K.B.; Manchester, S.R.; Wehr, W.C. (2003). "Corylus, Carpinus, and Palaeocarpinus (Betulaceae) from the Middle Eocene Klondike Mountain and Allenby Formations of Northwestern North America". International Journal of Plant Sciences. 164 (5): 807–822. doi:10.1086/376816. S2CID 19802370.

semanticscholar.org

api.semanticscholar.org

Pigg, K.B.; Manchester, S.R.; Wehr, W.C. (2003). "Corylus, Carpinus, and Palaeocarpinus (Betulaceae) from the Middle Eocene Klondike Mountain and Allenby Formations of Northwestern North America". International Journal of Plant Sciences. 164 (5): 807–822. doi:10.1086/376816. S2CID 19802370.