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OER are teaching, learning, and research resources that reside in the public domain or have been released under an intellectual property license that permits their free use and re-purposing by others. ~ William & Flora Hewlett Foundation
CTE Online - filtered for Hospitality, Tourism, and Recreation (you will need to create a free instructor account to access these materials)
OpenStax - These books were developed following traditional textbook publishing methods, including peer review, editorial support, and creation of ancillary content. Books are available in multiple formats (PDF, print on demand, on the Web) and are licensed to be revised and remixed by faculty who want to create a custom solution for a course.