TY  - BOOK
AU  - Sommerville,D M Y
TI  - The elements of non-Euclidean geometry
U1  - 513.8 SOM  
PY  - 1958///.
CY  - New York : 
PB  - Dover Publications, 
KW  - Hyperbolic geometry
KW  - Non-Euclidean geometry
N1  - Includes index
ER  -