Ayres, Frank. Schaum's outline of theory and problems of plane and spherical trigonometry / by Fran Ayres, Jr. - New York : McGraw-Hill Book, c1954. - 207 p. : ill. ; 28 cm. - (Schaum's outline series) . Includes index. ISBN: 070026513 Subjects--Topical Terms: Plane trigonometry.Spherical trigonometry. LC Class. No.: QA533 / .A97 1954