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The company Hercules Incorporated developed the first alkaline sizing in the 1950s that made acid-free paper possible. [10] Despite the advances in paper making and the identification of and concern around the brittle book problem, it took decades before the adoption of ANSI NISO Standard Z39.48-1984 - Permanence of Paper for Publications and Documents in Libraries in 1984.
Punched pockets are made in several sizes, with the most prevalent being A4 (210 mm × 297 mm; 8.3 in × 11.7 in) for Europe, or 8.5 by 11 inches (216 by 279 mm) for the United States. Depending on the location of the opening, punched pockets may be top-loading or side-loading which dictates how the document is inserted into the pocket.
Acidic paper is paper which was manufactured using acidic substances. [1] Widely used since the mid-nineteenth century, its pages become yellow within years, extremely brittle over decades, and eventually unreadable in the library and archive collections intended to preserve them. [2]
The logo of acid-free paper – a type of paper used for preservation: Date: 3 February 2014: Source: Image:Acid-free_paper.png: Author: GAllegre: Permission (Reusing this file) Public-domain original: Other versions: Image:Acid-free_paper.png, Perennial symbol.svg: SVG development
For example, 3 is a square root of 9, since 3 2 = 9, and −3 is also a square root of 9, since (−3) 2 = 9. The n th root of x is written as using the radical symbol. The square root is usually written as , with the degree omitted.
Simplification is the process of replacing a mathematical expression by an equivalent one that is simpler (usually shorter), according to a well-founded ordering. Examples include:
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1747 Olentangy River Rd, Columbus, OH · Directions · (614) 299-9425