The Brooklyn Public Library has a free Brooklyn Theater Playbills and Programs Collection.
“The Brooklyn Theater Playbills and Programs Collection is made up of approximately 800 items from the late 1880s until the 1940s. During this period, the performing arts thrived in Brooklyn. Please note that due to the scope and fragility of the collection, only a selection of covers from the collection have been digitized and are available online. In order to provide improved access, a complete finding aid (PDF) to the collection has been developed.”