Dressler, Isidore. Trigonometry / [electronic resource] / Isidore Dressler, Barnett Rich.. — New York : : Amsco,, c1975.. — xi, 385 p. : : ill. ; 21 cm. Includes index. Subjects--Topical Terms: Trigonometry.Trigonometry--Problems, exercises, etc. Dewey Class. No.: 516.24