The papers of Mary Dill Henry date from 1913 to 2021 and document Henry's life as an artist through a collection of biographical materials, writings, exhibition and museum files, project files, press, business records and artworks, compiled posthumously by Henry's family and by the fine art advisory service and sales brokerage Jeffrey Thomas Fine Art.

Series I: Biographical Material. Biographical materials include life documents, resumes and biographical summaries, student records, awards, files on friends and family, and personal photographs.

Series II: Writings. Writings include a draft for an unpublished book on the "magic" of Mendocino, California, a garden diary with accompanying photographs, and Henry's written statements about art and life.

Series III: Exhibition and Museum. Files Exhibition and museum files consist of records pertaining to Henry's work in exhibitions and museum collections, including correspondence, announcements, exhibition and museum catalogs, and photographs of Henry at exhibitions that featured her work.

Series IV: Project Files. Project files contain material concerning Henry's illustration work, graphic design, Architectural Arts mosaic and mural projects, work for Don Clever Design and Murals, Henry's master's thesis notebooks, and book cover artwork.

Series V: Press. Press items include collected journal articles, published interviews, exhibition reviews, and publicity brochures on Henry.

Series VI: Business Records Business records consist of documents related to Henry's business affairs, including correspondence with curators and galleries, records on sales and donations, price lists, artwork inventories, calendar pages, and photographs of artwork.

Series VII: Artwork. The series includes original artwork created by Henry, such as ink and pencil drawings, sketchbooks, and a painted self portrait.

Series VIII: Jeffrey Thomas Fine Art Files. This series consists of exhibition files, business records, photographic material, and artwork collected by Jeffrey Thomas Fine Art. Included in this series are digital records on Henry's life and art that were originally housed on a USB thumb drive.