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|This book was originally developed by the , 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. This textbook has been designed to meet California and U.S. standards.
The material is not current as CK-12 now has a "no commercial use" license that is incompatible with Wikibooks. This work is licensed under the Creative Commons Attribution-Share Alike 3.0 United States License and was adapted from CK-12.