00308nam a2200121Ia 4500008004100000082001400041100002200055245003400077260004300111300000800154942000700162999001700169190709s9999    xx            000 0 und d  a514 C885T  aCrowder, Norman A 0aTrigonometry : A first course  aLondonbThe english university pc1962  a250  cBK  c37033d37033