On the occurrence of the Great Grey Owl (Strix nebulosa) in Finland 1955–68
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Mikkola, H., & Sulkava, S. (1969). On the occurrence of the Great Grey Owl (Strix nebulosa) in Finland 1955–68. Ornis Fennica, 46(3), 126–131. Hämtad från https://ornisfennica.journal.fi/article/view/132769