Open Educational Resources: Open Textbook Network (OTN)

Open Textbook Network (OTN) is a consortium of colleges and universities working to advance open textbook initiatives. It currently supports the Open Textbook Library, a digital library of Open Access textbooks that are licensed through the creative commons. OTN provides links to the material, and faculty at institutions across the country provide feedback to the OTN on the usability, practicality, and comprehensiveness of the text (see their Review Guidelines for an in-depth look at this criteria). 

The Open Textbook Network Library is available at https://open.umn.edu/opentextbooks/subjects