I came across this video showing some good footage of the Glen Canyon Dam construction as well as some great shots of early Page Arizona. Some of the narration gets a little cheesy but the footage is amazing. You may even recognize some of the faces. I was surprised to see Chet Huntley narrating it. After the first minute and half to two minutes in, it picks up and gets good. The total length is only 27 minutes.
Enjoy!
A History of Glen Canyon Dam and Page Arizona 