List of oceanic depths and serial temperature observationd : received at the admiralty during the year 1898, from H.M surveying ships, indian marine survey and british submarine telegraph companie / Hydrographic Department
Técnicas de dirección de personal : (manual de personal) / Ramon de Lucas Ortueta
Testing and jointing of air space underground cables which required to be loaded and balanced for fuperposed telefone working / Post Office Engneering Department
Noções elementares de instalações exteriores de transmissão cabos II / Administração Geral dos CTT