The Marsh Warbler (Acrocephalus palustris) and Blyth´s Reed Warbler (Acrocephalus dumetorum) in the district of Lappeenranta, Summer 1960. Ornis Fenn [Internet]. 1961 Dec. 31 [cited 2025 Nov. 12];38(3–4):93–95. Available from: https://ornisfennica.journal.fi/article/view/132663