1930's chicago area theatre programs

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I have many theatre programs from chicago theatres that are dated around 1930. These are mostly trifold flyers that came out weekly with approx.6 different movies including stars and photos on each program flyer. I am looking for more info on these. To name a few of the theatres...Garfield, Embassy, Villas, Oak, Imperial...and many more. All are in excellant condition, I have hundreds since my grandfather managed several theatres at that time. Anyone know where I can learn more about them?