Davis, Hannibal Albert
Brief course in plane and spherical trigonometry
American Book, 1933
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Rice, Bernard J.
Plane trigonometry
Prindle, Weber & Schmidt, 1975
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Pignani, Tullio J.
Elements of trigonometry
Harcourt, Brace, and World, 1968
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Buchanan, Herbert E.
Plane trigonometry
Johnson Pub., 1926
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Kuechle, Richard T.
Trigonometry : a New approach
Wadsworth, 1984
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