State of New York No. 82, In Senate: Report of the Sub-Committee of the Committee on Cities Relative to Investigating the Feasibility of Underground Telegraphy in Cities, Together with the Testimony Taken at the Investigation, 1882-05-03, Box: 18, Folder: 16. Robert Dalton Harris, Jr. telegraph collection, 8720. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/1957420 Accessed October 19, 2026.