The Theatre Historical Society of America (THS) is the only organization in the U.S. which exclusively documents, preserves and celebrates the rich architectural, cultural and social history of America's theatres. Its archive contains material on more than 15,000 theatres, primarily in the United States. This unique resource is utilized in its publications and available to researchers.

Founded in 1969, THS is an IRS-approved 501(c)(3) non-profit educational organization, located in Elmhurst, Illinois on the second floor of Classic Cinemas historic York Theater.

More information on the Wikipedia page [1].

The website is [2].