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

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

Hann - Elements of Spherical Trigonometry - New paperback or softback - X555z

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

Murray - Elements of Plane Trigonometry - New paperback or softback - - X555z

Olandoski - Trigonometry High School - New paperback or softback - X555z

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

Kenyon - Trigonometry - New paperback or softback - 64 - X555z