Anybody know a good documentary on John Muir and/or the history of Yosemite?

I'm writing about it for my California history class. I've spent most of my life in that part of the Sierras but never really learned that much about Yosemite itself.

Google is being a PITA and keeps bombarding me with that climbing documentary and gopro footage of someone's vacation. I need historical stuff about the formation and early history of the park.