Collins, Mary. [from old catalog] Colour-blindness : with a comparison of different methods of testing colour-blindness / Mary Collins - London : K. Paul, Trench, Trubner & co., ltd. , 1925. - xxxi, 237 p. : ill. ; 22 cm. Includes bibliography and index. Subjects--Topical Terms: Color blindness. Dewey Class. No.: 617.7 / COC 1925