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

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