Relatorio da repartição geral dos telegraphos : do anno de 1897; apresentado ao Ministro da Industria, Viação e Obras Publicas / Álvaro Joaquim de Oliveira
Instructions to postmasters and others engaged in telegraph business / Post Office Telegraphs
Instructions regarding press telegrams / Post Office Telegraphs
Handbook for wireless telegraph operators : working installations licensed by his majesty's postmaster-general