The historical situation of diglossia in the Basque society cause Basque language was strongly but not totally excluded from scientific and technical subjects. This paper analyzes and classifies the tens of Basque writing works that can be said containing specialized language, published until 1976, as well as their contributions to the Basque terminology. The importance of those works and their terminology in aims of the modernization and specialization of the Basque language started after 1976 is also discussed.