Dupuis - An Elementary Treatise on Spherical Trigonometry microform - X555z

Beasley - An Elementary Treatise on Plane Trigonometry - New paperback - X555z

An Elementary Treatise on Plane Spherical Trigonometry (Classic Reprint)

An Elementary Treatise on Plane and Spherical Trigonometry (Classic Reprint)

Morrison - An elementary treatise on plane trigonometry with numerous - X555z

An Elementary Treatise on Plane and Spherical Trigonometry (Classic Reprint)

Benjamin - An Elementary Treatise on Plane Spherical Trigonometry - - X555z

Hymers - A Treatise On Plane and Spherical Trigonometry and On Trigon - X555z