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Петровнин, С.В. Биология зверей и птиц [электронный ресурс]: Учебно-методическая литература / С.В. Петровнин. — 1. — Москва: ООО "Научно-издательский центр ИНФРА-М", 2009 — 230 с. — ВО - Бакалавриат. — <URL:https://znanium.com/catalog/document?id=76368>. — <URL:https://znanium.com/cover/0466/466564.jpg>.
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