Todhunter, I. Spherical trigonometry for the use of colleges and schools / by I. Todhunter ; revised by J. G. Leathem - London : Macmillan ; New York : St. Martin's, 1960 - xii, 275 p. ; gráfs., il. Subjects--Topical Terms: MATEMATICASGEOMETRIATRIGONOMETRIAFUNCIONES TRIGONOMETRICAS Subjects--Index Terms: TRIGONOMETRÍA ESFÉRICA Universal Decimal Class. No.: 514.6