Bunkobon
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In Japan, bunkobon are small-format paperback books, designed to be affordable and space-saving.
An assortment of bunkobon in a bookshop
Dust jacket
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The dust jacket of a book is the detachable outer cover, usually made of paper and printed with text and illustrations. This outer cover has folded flaps that hold it to the front and back book covers
Bunkobon
…great majority of bunkobon are A6 (105×148mm or 4.1"×5.8") in size. They are sometimes illustrated and like other Japanese paperbacks usually have a dust wrapper over a plain cover. Modern bunkobon can include bestsellers and works of scholarship alike and their pocketbook size make them useful while commuting…
A dust jacket, propped up and partially unfolded for illustration
The back of a dust jacket, showing the ISBN
Front dust jacket art by Thelma Cudlipp for Don Marquis' Hermione and Her Little Group of Serious Thinkers, 1916.