The using of data on the moult progress in the study of migration periods of the annual cycle of passerines von Rymkevich, T.A., Smirnov, Eu.N., Starikov, D.A., Ufimtseva, A.A., Ryzhenkova, V.A., Kretova, A.Yu, Malyscheva, D.I., Bannikova, Yu.M.

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