Moult and measurements of Redpolls Carduelis flammea in North Sweden, 1968
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Pepper, S. R., & Kennedy, H. J. (1970). Moult and measurements of Redpolls Carduelis flammea in North Sweden, 1968. Ornis Fennica, 47(1), 35–36. Noudettu osoitteesta https://ornisfennica.journal.fi/article/view/132786