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* For K-12 textbooks: http://www.ck12.org/student/
 
* For K-12 textbooks: http://www.ck12.org/student/
 
* Directory of Open Access Journals: http://www.doaj.org/
 
* Directory of Open Access Journals: http://www.doaj.org/
 +
* MIT Machining videos: https://techtv.mit.edu/collections/ehs-videos/videos
    
==Donations==
 
==Donations==
43

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