00325nam a2200121Ia 4500082001700000100003500017245002400052260003600076300001900112490003800131500000500169700002900174  a516bH893.PP  aHughes, D. R. and Piper, F. C.  aProjective planesb  aNew YorkbSpringer-Verlagc1973  ax, 291p. Index  aGraduate texts in Mathematicsv 6  a  aPiper, F. C. ; jt. auth.