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CK-12 Foundation | Free Online Textbooks, FlashCards, Exercises, RWA's, Simulations

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CK-12 Foundation provides a library of free online textbooks, videos, exercises, flashcards, and real world applications for over 5000 concepts from arithmetic to history

Language: English Backlinks: 1,157 Alexa: 151,706 Most Popular In: United States (56,047) Web Safety: 96% Page Rank: 6 Last Checked: 31/07/2013
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