Geometrical researches on the theory of parallels/
Lobachevskii, N. I. 1792-1856.
Geometrical researches on the theory of parallels/ by Nicholas Lobatschewsky ; translated from the original by George Bruce Halsted. - Austin: University of Texas Press, 1892. - 50 p.: diagrs.; 23 cm.
On cover: Bulletin of the University of Texas.
Photocopy.
Austin, Tex. :
BookLab,
1996.
25 cm.
Geometry, Non-Euclidean.
516.1 / L796g
Geometrical researches on the theory of parallels/ by Nicholas Lobatschewsky ; translated from the original by George Bruce Halsted. - Austin: University of Texas Press, 1892. - 50 p.: diagrs.; 23 cm.
On cover: Bulletin of the University of Texas.
Photocopy.
Austin, Tex. :
BookLab,
1996.
25 cm.
Geometry, Non-Euclidean.
516.1 / L796g