Reliability of the line survey method in bird census, with reference to Reed bunting and Sedge warbler
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Haukioja, E. (1968). Reliability of the line survey method in bird census, with reference to Reed bunting and Sedge warbler. Ornis Fennica, 45(4), 105–113. Hämtad från https://ornisfennica.journal.fi/article/view/132748