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William Threlfall
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The helminth parasites of the herring gull (Larus argentatus Pontopp.)
William Threlfall · Commonwealth Agricultural Bureaux
23 sayfa · 1966
Bibliography / Birds / Helminthology / Herring gull / Parasites
Audiovisual materials concerning the care, use, behaviour and generalbiology of animals
William Threlfall · Atlantic Provinces council on the Sciences, Animal Care Committee
Sayfa sayısı yok · 1989
Animals / Audio-visual aids / Catalogs