The letter to George C. Tyler, a theatrical producer in New York, suggests a young actress that he “might keep in mind” for a part. “She has had a variety of experience,” it says, and “she comes from a good family.”

The well-bred lady was Katharine Hepburn, and the undated letter, from a family friend, is part of a cache of theater-related photographs, scrapbooks, journals, scripts and more. Four years after Hepburn’s death, the material forms a gift from her estate to the New York Public Library that is to be announced today. The documents, all related to Hepburn’s stage career, offer a revealing glance at her personality, profession and obsessions.