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This Open Source Chemistry Course (Grades9-12) course contains assignments and analysis for an Open Source Earth Science course for grades 9 - 10, and is a part of a set of collections that contain additional Earth Science resources that can be…

Elementary Calculus, An Infinitesimal Approach by H. Jerome Keisler

This course contains assignments and analysis for an Open Source Earth Science course for grades 9 - 10, and is a part of a set of collections that contain additional Earth Science resources that can be accessed at http://www.curriki.org/ after you…

This High School Trigonometry textbook is by the CK-12 Foundation, a non-profit whose mission is partly to reduce the cost of textbook materials worldwide using a collaborative web-based model called the "FlexBook".