Everyone Here Spoke Sign Language: Hereditary Deafness on Martha's Vineyard
Nora Ellen Groce
A study of Martha's Vineyard Island in the USA, which, for over two hundred years had a high incidence of hereditary deafness. The residents simply compensated by inventing or borrowing an efficient sign language, which was used by almost everyone, hearing and deaf alike.
Paperback 169 pages 1985