This list of Open Education Resources will provide textbooks and supplements that can help you to understand course concepts. These are free and can be accessed at any time.
MERLOT - MERLOT is a program of the California State University System partnering with education institutions, professional societies, and industry. All materials are reviewed for suitability and many undergo more extensive peer review.
OER Commons - Digital public library and collaboration platform of ISKME (Institute for the Study of Knowledge Management in Education). Platform contains records for work from numerous providers including several universities and the DPLA among many others.
Open Textbook Library - Supported by the Center for Open Education at the University of Minnesota and the Open Textbook Network, an alliance of higher education institutions.
LibreTexts - An open textbook repository initiated at the University of California, Davis, providing open textbooks for a wide variety of academic subjects and disciplines.
