TY  - BOOK
AU  - RINGENBERG,Lawrence A.
AU  - 
TI  - Informal geometry. 
U1  - 513/RII 
PY  - 0000///Wiley.
PY  - 1967///
CY  - New York. 
KW  - Geometry.
KW  - Geometry
N1  - Includes index and bibliography.
ER  -