Size: 20 Linear feet (on 19 microfilm reels)
Summary: Papers documenting Ustick's work in Philadelphia, Washington, D.C., Venezuela, and other locations, and include detailed information on Girard College, Philadelphia, and the U.S. Capitol Building. Included are letters from Randolph Rogers, Robert Mills, and M.C. Meigs regarding the Capitol.
Diaries include entries about meetings Ustick attended, and sometimes financial information and drawings; 21 volumes of letterbooks indexed by Walter include personal and professional letters; and account books of specific projects and of general topics.
Bound manuscripts titled "Notes on Architecture, 1830," and "Notes on the Executive Mansion repairs"; loose manuscript files on specific projects such as the Chester County Courthouse, the American Institute of Architects, and Girard College; and photographs of 333 of the 503 architectural drawings included in the collection.