Calf-binding (also sometimes called half-calf, full-calf, half-bound or full-bound, depending on the amount, or simply leather-bound ) is a book bound with rigid protective covers typically made of binder's board and covered in leather, usually from a calf. Being usually bound in the same way as hardcovers, they may have flexible sewn spines which allow the book to lie flat on a surface when opened.

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