[1]
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 (Dec. 1961), 93–95.