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Kelly, Robert L.,. The fifth beginning: what six million years of human history can tell us about our future / Robert L. Kelly. — 1 online resource (pages cm). — Доступ по паролю из сети Интернет (чтение, печать, копирование). — <URL:https://elib.spbstu.ru/ebsco/pdf/1350228.pdf>. — <URL:https://elib.spbstu.ru/ebsco/epub/1350228.epub>. — Текст: электронный
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