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Byrkjedal, I., Kyllingstad, K., Efteland, S. and Grøsfjell, S. 2012. Population trends of Northern Lapwing, Eurasian Curlew and Eurasian Oystercatcher over 15 years in a southwest Norwegian farmland. Ornis Norvegica. 35, (Feb. 2012), 16-22. DOI:https://doi.org/10.15845/on.v35i0.238.