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The 2008 NAEP long-term trend assessment is currently being administered to students throughout the nation. Results will be released in 2009.
In 2004, NAEP administered the latest long-term trend assessment to approximately 75,000 students at ages 9, 13, and 17 in public and nonpublic schools throughout the nation. 
Exploring NAEP Long-Term Trend
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How the NAEP Long-Term Trend Assessment Works
Using NAEP Data
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