Open Textbook Network Created at U of M is Saving U.S. College Students Millions of Dollars | KSTP.com

"An idea, born at the University of Minnesota has now become the Open Textbook Network.  Ernst says teachers at 250 schools in the United States use it.  "As of last spring, the Open Textbook Network saved students $3.1 million nationally. And we are just getting going, "he said."