book pocket
A receptacle of stiff paper, cloth, buckram,
leather, or an ordinary envelope, pasted on the
inside of a book usually the lower cover to hold
loose material, maps, charts, user cards, etc.
Some book pockets, such as those found in many
English (as well as Continental) almanacs from the
late 17th to the early 18th centuries, have
concertina (expansion) folds at head and tail and
open at the fore edge. Sometimes a COMPENSATION GUARD is
required to provide for the thickness of the
material in the pocket. The opening of the typical
pocket is at the head, or less often, at the
binding edge. (12 )
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