Lobachevskiĭ, N. I. <br/><br/>
Geometrical researches on the theory of parallels 
by Nicholas Lobachevski ... tr. from the original by George Bruce Halsted ... 
 - New ed. 
 - Chicago [etc.]  Open Court Publishing Company  1914. 
 - 50 p.  front. (port.) diagrs.  25 cm. 
<br/><br/>Bibliography: p. 49-50. 
<br/><br/><label>LCCN: </label>14013988  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geometry, Non-Euclidean
<br/><br/><label>LC Class. No.: </label>QA685  / .L78 1914