00261nam a22000977a 4500003000600000005001700006008004100023040000700064245006300071260002900134DE-3120141015152436.0141015b        xxu||||| |||| 00| 0 ger d  ccg  aTrigonometrie der EbenebMittelstufecDr. Heinrich Hofmann  aFrankfurt am Main c1956