Lobachevski, Nicholas <br/><br/>
Geometrical researces on the theory of parallels / 
by Nicholas Lobachevski ; translated by George Bruce Halsted 
 - Chicago :  Open Court Pub.,  1914 
 - 50 p. ;  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential topology<br/>Parallels (Geometry)
<br/><br/><label>Dewey Class. No.: </label>513.84