122-M-162: Walter, T.U. - Message from the President of the United States communicating the report of the architect for the extension of the Capitol, showing the condition of that and the other public works in his charge, 1852 February 11, Box: 10, Folder: 6. Thomas Ustick Walter collection, LAC-122. The Athenaeum of Philadelphia. https://archives.philaathenaeum.org/repositories/3/archival_objects/8400 Accessed April 30, 2026.