Just FYI: there is non profit organization that try to adopt open source model for development and creation of online textbook for K-12 curriculum, you can read more at: http://www.ck12.org/aboutus.html
Just FYI: there is non profit organization that try to adopt open source model for development and creation of online textbook for K-12 curriculum, you can read more at: http://www.ck12.org/aboutus.html