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WELLS'

MATHEMATICAL SERIES.

Academic Algebra.

University Algebra.

Plane Geometry.

Solid Geometry.

Plane and Solid Geometry.

Plane and Spherical Trigonometry.

Plane Trigonometry.

Essentials of Trigonometry.

Logarithms (flexible covers).

Elementary Treatise on Logarithms.

Special Catalogue and Terms on

application.

THE

ESSENTIALS

OF

PLANE AND SPHERICAL

TRIGONOMETRY.

BY

WEBSTER WELLS, S.B.,

ASSOCIATE PROFESSOR OF MATHEMATICS IN THE MASSACHUSETTS
INSTITUTE OF TECHNOLOGY.

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LEACH, SHEWELL, & SANBORN,

BOSTON AND NEW YORK.

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