Posted on February 22, 2014April 2, 2017 by Shirley HartungThank you, Canada! How did Canada help Dr. Salk and his team with the production of the polio vaccine? Find the answer in the Activity Book. Look for the Canadian flag! Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window) Related
