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The American Forest & Paper Association says that the standard US dimensions have their origin in the days of manual papermaking, the 11-inch length of the standard paper being about a quarter of "the average maximum stretch of an experienced vatman's arms". The precise origins of the dimensions of US letter-size paper (8.5 × 11 in) are not known. The related paper size known as half letter, statement, or organizer L is exactly one half of the US Letter size: 8.5 by 5.5 inches (215.9 by 139.7 mm) (8.5 × 5.5 in). The most common density of A4 paper is 80 g/m 2. For example, 20-pound paper is also labeled as 75 g/m 2. Some metric information is typically included on American ream packaging. One ream of 20-pound Letter-sized paper weighs 5 pounds (2.3 kg), and a single Letter-sized sheet of 20-pound paper weighs 0.16 ounces (4.536 g), which is equivalent to 75.19 g/m 2. Typical Letter paper has a basis weight of paper of 20 or 24 pounds (9.1 or 10.9 kg) – the weight of 500 sheets (a ream) of 17-by-22-inch (431.8 by 558.8 mm) paper at 70 ☏ (21 ☌) and at 50% humidity. In the US, paper density is usually measured in "pound per reams" (of 500 sheets). The Reagan administration made Letter-size paper the norm for US federal forms in the early 1980s previously, the smaller "official" Government Letter size, 8 by 10.5 inches (203.2 by 266.7 mm) (aspect ratio: 1.3125), was used in government, while 8.5-by-11-inch (215.9 by 279.4 mm) paper was standard in most other offices.
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