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Composition of the Finnish populations of capercaillie, Tetrao urogallus, and black grouse, Lyrurus tetrix, in the autumns of 1952-1961, as revealed by a study of wings
11.988/23 -- HELMINEN, Matti: -- Composition of the Finnish populations of -- capercaillie, Tetrao urogallus, and black -- grouse, Lyrurus tetrix, in the autumns of -- 1952-1961, as revealed by a study of wings. -- Helsinki 1963.124 S.mit 28 Fig.8° -- (Papers on game research,23.) -- 1964:4112 d. -- Fi.