00298nam a2200121Ia 4500008004100000082001500041100001800056245002300074260004200097300001300139942000700152999001700159190709s9999    xx            000 0 und d  a514.5 R435  aRider, Paul R 0aPlane trigonometry  aNew yorkbThe macmillan companyc1949  aviii,180  cBK  c40470d40470