Amazon Wireless Telegraph and Telephone Company. "Petition to U.S. Secretary of State for aid in protecting Company's rights and concessions in Brazil,", 7 December 1911.

Amazon Wireless Telegraph and Telephone Company. "Petition to U.S. Secretary of State for aid in protecting Company's rights and concessions in Brazil,", 7 December 1911., Folder: 102. Miscellaneous Manuscripts at the Benson Latin American Collection, BENSON-MS Miscellaneous Manuscripts. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/351415 Accessed September 27, 2026.