The Oscar winner for Best Documentary in 1955, Helen Keller in Her Story (also known as The Unconquered) chronicles the life of the author/political activist/lecturer with footage of her then at 74-years-old as well as newsreel clips and stills. Director Nancy Hamilton was also able to interview Dwight Eisenhower on Keller for the film.
In an interesting side note, the late director Hamilton is well known as a songwriting. Her most recognized work "How High the Moon"—a jazzy tune she originated in the '40s—has been used in films as recent as The Blind Side, Good Night, and Good Luck and Casino.
To rent or buy Helen Keller in Her Story, go to the Reframe Collection.