The collection includes drafts, chapter notes, project files, articles, liner notes, research materials, business papers and correspondence related to Jablonski's literary projects. The project files chiefly consist of materials used in the preparation and publication of Jablonski's books on such American composers and songwriters as Harold Arlen, Irving Berlin, George Gershwin and Alan Jay Lerner. There are also project files related to Jablonski's books on musical theater and American music. The miscellaneous materials contain personal correspondence, business papers and a small amount of personal items. Jablonski also wrote extensively on aviation history, and there are several articles and correspondence related to his work in this field.