CK-12 books 
These books were originally developed by the CK-12 Foundation, a non-profit organization with a mission to reduce the cost of textbook materials for the K-12 market both in the U.S. and worldwide.  | 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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