)](https://rukminim1.flixcart.com/image/400/400/xif0q/book/d/1/h/geometrical-researches-on-the-theory-of-parallels-by-nicholas-original-imagk5ggwkkpfkap.jpeg?q=90 "Geometrical researches on the theory of parallels by Nicholas Lobachevski. Translated from the original by George Bruce Halsted. 1914 [Hardcover](Hardcover, Lobachevskiĭ N. I. (Nikolaĭ Ivanovich))")
Geometrical researches on the theory of parallels by Nicholas Lobachevski. Translated from the original by George Bruce Halsted. 1914 [Hardcover](Hardcover, Lobachevskiĭ N. I. (Nikolaĭ Ivanovich))
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