00314nam a2200121Ia 4500082001800000100002000018245003700038260005200075300002000127490003500147500000500182700000500187  a516bSt857.SH  aStillwell, John  aSources of hyperbolic geometryb  aProvidencebAmerican Mathematical Societyc1996  aix, 153p. Index  aHistory of Mathematicsv v. 10  a  a