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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
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