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"Less durable books mean they must be replaced more often, perhaps annually, and this would result in a significantly increased cost to school systems," Driesler says.
That's the bad news. The good news: The durability and opacity thresholds set by the National Association of State Textbook Administrators (NASTA), the Book Manufacturers' Institute (BMI), and the Association of American Publishers are the same for 45-lb. papers and lighter weight papers.
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