Toivari, L. and Lindqvist, O. (1961) “The Marsh Warbler (Acrocephalus palustris) and Blyth´s Reed Warbler (Acrocephalus dumetorum) in the district of Lappeenranta, Summer 1960”, Ornis Fennica, 38(3–4), pp. 93–95. Available at: https://ornisfennica.journal.fi/article/view/132663 (Accessed: 23November2024).