- Digital Commonwealth
- Perkins School for the Blind
Two girls standing behind a table with two grooved, wooden rods on a frame in front of them. They hold their hands up with one palms up and the other palms down. Imperial Royal Institute for the Education of the Blind, Vienna. Alexander Mell.
Black and white photograph
- Samuel P. Hayes Research Library, Perkins School for the Blind, Watertown, MA. Contact host institution for more information.