Mallory, Virgil Sampson, 1888-1959. New trigonometry, including the elements of spherical trigonometry. - Rev. ed. - Chicago, B.H. Sanborn [1955] - 264 p. illus. 22 cm. LCCN: 55001868 Subjects--Topical Terms: Trigonometry. LC Class. No.: QA531 / .M35 1955 Dewey Class. No.: 516.24/MAL