Rietz, Henry Lewis Plane and spherical trigonometry [by] H. L. Rietz, J. F. Reilly, and Roscoe Woods. - 3d ed. - New York Macmillan 1950. - xiii, 205 p. diagrs. 22 cm. - A Series of mathematical texts (for colleges) . LCCN: 50007887 Subjects--Topical Terms: Trigonometry LC Class. No.: QA531 / .R53 1950 Dewey Class. No.: 514.5