The Dos-à-Dos binding.
In bookbinding, a dos-à-dos binding (from the French meaning "back-to-back") is a binding structure in which two or more separate books are bound together such that the fore edge of one is adjacent to the spine of the other, with a shared lower board between them serving as the back cover of both.
A five fold dos à dos b: inding from 1736.
When shelved, the spine of the book to the right faces outward, while the spine of the book to the left faces the back of the shelf; the text of both works runs head-to-tail.
The dos-à-dos format dates back at least to the 16th century, though they were most common in England was in the first half of the 17th century.
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