00269nam a2200097Ia 4500008004100000082001500041100001800056245003800074260004200112300001700154190709s9999    xx            000 0 und d  a514.5 R395  aRichardson, M 0aPlane and spherical trigonomentry  aNew yorkbThe macmillan companyc1960  axiv,343,xxii