The earliest printing for the blind was the embossed lettering system developed by Valentin Haüy, the founder, in 1784, of the first school for the blind in Paris. In 1819 Louis Braille entered this school. This is an 1806 French grammar by Lhomand, printed in Haüy's lettters. 1/ 
"Elémens de la grammaire française, adoptés par le Gouvernement, pour les lycées et pour les écoles secondaires. Nouvelle édition [...], par un chef de lycée. Ces Elémens ont été imprimés par les aveugles et à leur usage, en l’hospice impérial des Quinze- Vingts." Paris 1806. 2/
A bibliographic mystery is the rarity today of early imprints in Louis Braille's dot system. While books in predecessor systems like Haüy's turn up now & then and books in the Moon system are found frequently, one almost never sees a 19th cent. example of actual Braille printing.
Histories of writing for the blind usually say that after some initial resistance, widespread adoption of Louis Braille's system began in the 1850s and was near universal by the 1880s. If this is really the case, where are the books? One simply doesn't see pre 1900 Braille books.
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