00292nam a2200109Ia 4500008004100000082001500041100001600056245004800072250000800120260004300128300001100171190709s9999    xx            000 0 und d  a51435 H652  aHobson, E W 0aTreatise on plane and advanced trigonometry  a7th  aNew yorkbDover publications Incc1957  axv,383