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Mathematics - Open Textbooks
College Algebra, 3rd Corrected Edition (Open Textbook)
This open textbook is available freely online with a Creative Commons BY-NC-SA license.
Authors: Carl Stitz and Jeff Zeager
Publication Date: 2013
Trigonometry (Open Textbook)
This open textbook is available freely online with a GNU Free Documentation License, Version 1.3 or any later version.
Author: Michael Corral
Publisher: Schoolcraft College
Publication Date: 2009
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