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Perfect binding
From LISWiki
A rapid and relatively inexpensive method of adhesive binding in which the back of a volume is trimmed to produce a block of leaves, the back edge of which is roughened. Adhesive is then applied (usually hot-melt) and the case attached. Durability depends on the ability of the adhesive to secure each leaf and remain flexible over time. Used mainly in binding special editions, such as book club editions.
