The collection includes over 140,000 pages of correspondence, which serves as a core resource for understanding Wright's personal and professional activities, relationships, and ideas. The correspondence also includes project records such as specifications, contracts, supply orders, invoices and receipts. Letters from the 1880s through the 1920s accounts for only 2% of the total correspondence in the collection (approximately 2,000 documents). The bulk of the correspondence is from the 1930s until Wright's death in 1959.

Manuscripts of American architect Frank Lloyd Wright contain his working drafts and final versions of his writings (published and unpublished), lectures, and talks dating from 1894 until his death in 1959. The collection consists of approximately 2,785 drafts amounting to over 31,000 sheets. The manuscripts range from handwritten drafts to heavily corrected typescripts and galley proofs. Included in this comprehensive collection of writings are a large number of unpublished pieces which expand upon Wright's published ideas on architecture, art and aesthetics, and which provide further insights into the architect's views on politics, religion, morality and various other topics.

"Talk to the Taliesin Fellowship" was a regular lecture series at Taliesin where Wright addressed the fellows and apprentices on a range of philosophical and personal topics. The collection consists of transcripts and audio recordings of those talks as well as additional talks given by Wright to various public audiences.