All at once he heard, not far from the edge of the wood, the sound of Varenka’s contralto voice,
Leo Tolstoy. Anna Karenina (1878)
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Out in the yard a woman’s hoarse contralto intoned a hymn.
Ralph Ellison. The Invisible Man (1952)
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at that moment a nightingale in the wood suddenly uttered two low contralto notes. Half a minute later it gave a tiny high trill and then, having thus tried its voice, began singing. Savka jumped up and listened.
Anton Chekhov. The Witch and other stories
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“Mamma!” rang out the clear contralto notes of her childish voice,
Leo Tolstoy. War and Peace: With bonus material from Give War and Peace A Chance by Andrew D. Kaufman
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Whenever her mouth was not corked with clothes pegs she was singing in a powerful contralto: