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    Chapter

    Density Variations of Bird Populations in High Mountain Habitats, Hardangervidda

    Five study areas situated in the mid- and low-alpine zones (Dahl, 1975) on the mountain plateau of Hardangervidda were chosen for surveys of density variations of bird populations, carried out from 1967 to 1973, ...

    L. Lien, E. Østbye, A. Hagen, H.-J. Skar, D. Svalastog in Fennoscandian Tundra Ecosystems (1975)