Paperback book sizes vary slightly, depending on where they are printed. In North America mass market paperbacks are 4 1/4 x 7 inches while trade paperbacks are 5 1/2 x 8 1/2 inches. In other parts of the world, paperback books are either A format (6 7/8 x 4 1/4 inches), B format (8 x 5 1/4 inches) or C format ( 8 3/4 x 5 5/8 inches).
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