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Бетехтин А.Г. - Минералогия (1950).pdf
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Бетехтин А.Г., Зверев В.Н., Татаринов П.М. - Краткий курс месторождений полезных ископаемых - 1938.pdf
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Бетехтин А.Г. - Курс минералогии - 1956.djvu
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