Measurements of the Siberian Nutcracker Nucifraga caryocatactes macrorhynchos and clines in irruption studies
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Lehikoinen, E. (1979). Measurements of the Siberian Nutcracker Nucifraga caryocatactes macrorhynchos and clines in irruption studies. Ornis Fennica, 56(1), 24–29. Hämtad från https://ornisfennica.journal.fi/article/view/133000