Just like traditional textbooks, open educational materials must be accessible to all students. Below are resources that help with accessibility standards for OER.
Everything published by the Federal government is free of any copyright restrictions. The research, reports and websites can be useful resources for classes when creating your own course material.
A great starting place to search is USA.gov.
Try to search a specific agency's website. A-Z List of Federal Agencies. Many times these materials are not retrieved with simple Google searches. Here are some examples of US Federal Databases.
The Homeland Security Digital Library is a collection of documents related to homeland security policy, strategy, and organizational management. Topics include maritime, unmanned aerial systems, terrorism, epidemics and many more.
SciTech Connect is a collection of science, technology, and engineering research information from the U.S. Department of Energy.