Department of the Army (reply to suggestion by W.E. Pratt that Panama Canal was obsolete and that it must be replaced by pipelines from Southern Mexico), Box: 3, Folder: 50. Wallace E. Pratt papers, RH MS 870. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/34008 Accessed May 19, 2024.