Series 3: Correspondence and Related Materials includes Lilienthal's correspondence to and from colleagues and professional contacts. There is some personal correspondence and in some cases reference to personal correspondence that is included in other series or subseries. Materials include correspondence about Lilienthal's publications and occassionally drafts of memoranda or speeches on particular subjects.

Series 4: Documents contains personal records of Lilienthal's academic and professional careers.

Series 5: Appointment Books and Lists consists of Lilienthal's appointment books and daily appointment records from 1932-1948.

Series 6: Expense Records: Tennessee Valley Authority consists of Lilienthal's financial records, predominantly expense account reports, connected to his time at the Tennessee Valley Authority.

Series 7: Publications About or Relating to David E. Lilienthal includes magazine or professional journal articles about Lilienthal, the organizations he worked for, or subject matter related to his professional career (e.g., atomic energy).

Series 8: Clippings consists of newspaper clippings about Lilienthal, the organizations he worked for, or subject matter related to his activities and professional career.

Series 9: Press Releases: Atomic Energy Commission consists of one bound file of press releases issued during Lilienthal's time at the Atomic Energy Commission. The first pages are an index to the press releases in the file.

Series 10: Scrapbooks consists of several scrapbooks containing predominantly newsclippings of people and events related to Lilienthal, the organizations where he worked, and subject matter related to his work. These materials cover the period from 1931 to 1949, beginning when Lilienthal was at the end of his time with the Wisconsin Public Service Commission and continuing through his years at both the Tennessee Valley Authority and the Atomic Energy Commission.

Series 11: Films consists of various 16 mm films and two video films. THe contents have not examined, but the labeling indicates that they include work-related as well as family scenes and visits abroad.

Series 12: Phonograph and Audio Tape Recordings consists of phonograph, reel-to-reel and audio tape recordings, including recordings of speeches and interviews given by Lilienthal.

Series 13: Memorabilia includes various memorabilia concerning Lilianthal's student dates and career, including framed items..

Series 14: Supplementary Materials: Personal Financial Records consists of Lilienthal's personal financial records from 1920 to 1949.

Series 15: Manuscript Journal (Unpublished) consists of the journals Lilienthal kept on a regular basis from 1915 to 1949. While some of this material may have been incorporated into the published version of his later journals, most of the material from his earlier years did not get published.

Series 16: Publications and Writings by David E. Lilienthal contains notebooks of his journals in typewritten and shorthand form, microfilm, and pre-publishing versions (drafts, galleys, and proofs). The microfilm version includes journals from Lilienthal's earlier days that were not published. Also included are records of other publications: his books, articles, and collections of post-publication news clippings related to his publications.

Series 18: Correspondence and Related Materials consists of mostly professional correspondence to and from Lilienthal from 1905 to 1981. Some correspondence relates to particular subjects and are labeled as such (e.g., Argentina) rather than as correspondence to or from a particular individual.

Series 21: Financial Records: Personal consists of Lilienthal's personal and family financial records from 1924 to 1981.

Series 25: Photographs includes a wide variety of photographs of personal and professional events.