This is amazing. The Media History Digital Library has offered their collection online for free for anyone to browse.
I've been a subscriber to American Cinematographer for years, and occasionally they reproduce an old article on a classic film production in recent issues. What you realize is that sure technology over the years changes things, but the bare essentials of theory and technique never change.
In the old issues the focus was mostly on lighting set ups and techniques, which even today is very important to know.
So if there's a classic scene that you wondered how it was lit, you may be able to find it in one of these issues. There's also access to a ton of other magazines so this should give you hours and hours of study time.
Hurry Up and Wait Link: http://goo.gl/xoiTfo