Materials are largely in their original order. Most folders are arranged chronologically. Within the folders the material is arranged chronologically in descending order. Some arrangement was imposed by archivists when original order was not known, or materials had been separated from the rest of the collection, as in Series VI through VIII.
The collection is arranged into 8 series and 19 subseries:
Series I: Subject, Historical Reference, and Personal Files
Subseries A: Subject Files
Subseries B: Historical Reference Files
Subseries C: Personal Current Papers (Restricted)
Subseries D: Personal Notebooks
Series II: Research, Committees, Talks, Reviews, Still's Articles
Subseries A: Published Sources
Subseries B: Original Research
Subseries C: Published Sources
Subseries D: NYU Committees
Subseries E: Talks, Reviews
Subseries F: Partial Collection of Articles in Historical Journals
Series III: NYC Research
Subseries A: Landmarks
Subseries B: Research on NYC
Subseries C: Sources about Urbanism and Urban Development
Subseries D: Mirror For Gotham Research Materials
Series IV: Speeches, Reviews, Doctoral Student Files, Mayoral Research, NYU Archives
Subseries A: Speeches, Reviews, Press
Subseries B: Doctoral Students (Restricted)
Subseries C: Mayoral Research
Subseries D: Archives, Talks, and Articles
Series V: Correspondence
Subseries A: Correspondence
Subseries B: NYC Research
Series VI: Landmarks
Series VII: Copper Photo Engravings
Series VIII: Books on New York City and Urban America