O espirito challenger / Rui Morais de Sousa; préf. Amândio da Fonseca
Catalogue des publicatons de la CEI / Internacional Electrotechinical Commission
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