The collection contains correspondence, diaries, unpublished manuscripts, and copies of published writing. The twelve folders of correspondence, although primarily incoming, include exchanges between Brooker and other artists such as LeMoine Fitzgerald, William Arthur Deacon, and Pelham Edgar. His diaries consist mostly of fragmented excerpts of short, intermittent periods in his life. The heart of the collection is a core of his literary works, most of which have never been published. Most consist of original and second drafts showing evolutionary changes, corrections, and notations. There are thirty-five plays, portions of novels, seventy-five short-stories, essays (most of which are unpublished), and a considerable amount of poetry. Most of the poetry has been published by Professor Birk Sproxton in a book by Turnstone Press titled Sounds Assembling (1980). Several of the poems are in multiple drafts, though only a few are dated. Brooker's published writings on advertising remain with the family. Art work is not included in the collection. The balance of the manuscript collection consists of newspaper clippings, photographs, an account book, and other miscellaneous items. The collection also contains Brooker's private research library consisting of approximately 300 volumes, many of which are carefully annotated.