00300nam a2200109Ia 4500008004100000022001900041040002500060082001700085100001900102245003700121260003200158240215s9999    xx            000 0 und d  a971-08-1918--6  aNORSU-DumcNORSU-Dum  a514/R43/1971  aRider, Paul R. 0aPlane and Spherical Trigonometry  bThe Macmillan Companyc1971