In the metric system, series of standard paper sizes based on portions of a square meter. The basic paper sizes are known as the A series, and the B series comprises intermediate paper sizes to the A series. The length-to-width ratio is maintained from size to size. The metric standard size that corresponds most closely to the United States standard letter size of 8H x 11 is A4-size paper. (See A Series and ISO Paper Sizes. See also Basis Weight and Grammage.) The sizes and area of B series paper (from sizes B0 to B10) are as follows: [Insert]
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