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  1. C

    Siberian Chiffchaff

    Nice paper, thank you! However, I saw in the references: Buturlin, S. A., & Dementiev, G. P. 1937. [Identification Guide to the Birds of the USSR.Vol. 4. Passeriformes.] Moscow - Leningrad. (In Russian) From this book I will translate something interesting about the defference of abietinus and...
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