Trigonometry for secondary schools;
Butler, Charles H. b. 1894.
Trigonometry for secondary schools; plane and spherical [by] Charles H. Butler [and] F. Lynwood Wren. - [Boston] D. C. Heath [1957] - vii, 360 p. illus., diagrs. 23 cm.
Trigonometry.
QA 531 / .B96 1957
514
Trigonometry for secondary schools; plane and spherical [by] Charles H. Butler [and] F. Lynwood Wren. - [Boston] D. C. Heath [1957] - vii, 360 p. illus., diagrs. 23 cm.
Trigonometry.
QA 531 / .B96 1957
514