Sommerville, Duncan M'Laren Young,  1879- <br/><br/>
The elements on non-Euclidean geometry / 
by Duncan M'Laren Young Sommerville 
 - New York :  Dover Pub.,  1958 
 - 274 p. :  ill. ;  21 cm. 
<br/><br/><label>ISBN: </label> USD 2.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geometry, Non-Euclidean<br/>Geometry--Hyperbolic<br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>513.8