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Geometrische Untersuchungen zur Theorie der Parallellinien

Lobachevskiĭ, N. I. (Nikolaĭ Ivanovich), 1792-1856 · 1887 · Berlin : Mayer & Müller · 3 pictures

Geometry, Non-Euclidean · Parallels (Geometry)

Internet Archive · Smithsonian Libraries · Public domain (published before 1931) · More from this library