Gehrmann, James. Trigonometrķa / James Gehrmann ; Thomas Lester. - San Diego, Estados Unidos Harcourt Brace Jovanovich 1988 - x, 299 p. 27 cm. ISBN: 0-15-599748-3 Subjects--Topical Terms: TRIGONOMETRIA. Dewey Class. No.: 514/G274t