00348nam a2200109Ia 450000500170000000800410001705000150005810000160007324500940008926000260018365000290020920251229190551.0251229s9999    xx            000 0 und d  aQA 531 .A9  aAyres,Frank 0aSchaum's outline of theory and problems of plane and spherical trigonometry.cFrank Ayres  aNewYorkbSchaumc1954  aMathematics-Trigonometry