"Open Educational Resources" by Ron Mader is licensed under CC BY 2.0
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
For a more comprehensive overview on OER, see:
" John Inzinna physical therapy assistant Brook Army Medical Center, San Antonio, TX, helps Capt. Wendy Koseka 19th Airlift Wing legal officer Little Rock Air Force Base, build up her quadriceps muscle using gravity, during a physical therapy session at Brook Army Medical Center?s outpatient physical therapy clinic. (U.S. Air Force photo/Steve Thurow) Captain, family reflect on blessings John Inzinna physical therapy assistant Brook Army Medical Center, San Antonio, TX, helps Capt. Wendy Koseka 19th Airlift Wing legal officer Little Rock Air Force Base, build up her quadriceps muscle using gravity, during a physical therapy session at Brook Army Medical Center?s outpatient physical therapy clinic." by US Air Force is in the Public Domain
This is a sample of several OER physical therapy textbooks or course materials available. Additional OER in your subject may be found by searching the resources listed on the ACC Libraries primary Open Educational Resources Guide.