Rosenbach - Plane Trigonometry - New paperback or softback - 95 - X555z

Kumar - TRICKS OF TRIGONOMETRY - New paperback or softback - X555z

Newcomb - Essentials of Trigonometry - New paperback or softback - X555z

Todhunter - Trigonometry for Beginners - New paperback or softback - 1 - X555z

Borchardt - A New Trigonometry for Schools - New paperback or softback - X555z

Smith - A Key to Elementary Trigonometry - New paperback or softback - - X555z

Wells - Complete Trigonometry - New paperback or softback - 63 - X555z

Morgan - Trigonometry and Double Algebra - New paperback or softback - - X555z