OER2Go
The Web Unplugged

World Possible
CK-12

English 2.0 GB Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)
High quality textbooks for students from sixth grade through high school on STEM (Science, Technology, Engineering and Math) from ck12.org.
http://www.ck12.org/
Download Options

Zip File over the web
Zip File over FTP (host: dev.worldpossible.org user/pass: anonymous)
Rsync
Copy & paste the above command to any Unix-based system to begin download. Rsync can pick up where it left off and only downloads changes. It's the most efficient way to stay up-to-date with OER2Go modules.
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