The elements of plane trigonometry. by R. Lachlan and W.C. Fletcher ; put into braille by H.M. Taylor.
Lachlan, Robert.
Fletcher, W. C.
Taylor, H. M.
British and Foreign Blind Association (London, England)
London : British and Foreign Blind Association,
1909.
Tactile text.
Blind
Trigonometry, Plane.