Contact the Open Education Librarian, Brenda Smith, for help on finding what OER resources are currently available in your field.
You can narrow your Google search to find openly licensed resource:
What do the usage rights permit?
"Open Education Resources (OERs)" by TRU Libraries is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Based on a work at http://open.bccampus.ca/bcoer-librarians/bcoer-guides/.