Butler, Charles H. 1894-
Trigonometry for secondary schools : plane and spherical / [by] Charles H. Butler [and] F. Lynwood Wren. - Boston : D. C. Heath, c1948. - vii, 360 p. illus., diagrs. 23 cm.
48008695
Trigonometry.
QA531 / .B96
514 / BUT
Trigonometry for secondary schools : plane and spherical / [by] Charles H. Butler [and] F. Lynwood Wren. - Boston : D. C. Heath, c1948. - vii, 360 p. illus., diagrs. 23 cm.
48008695
Trigonometry.
QA531 / .B96
514 / BUT