Most incunabula sine notis printed at Salamanca have traditionally been attributed to the ‘first anonymous printer at Salamanca’, also known as the Printer of Nebrissensis Introductiones latinae (as he appears in ISTC and GW) or to the ‘second anonymous printer at Salamanca’, also known as the Printer of Nebrissensis Gramática (as he appears in ISTC and GW). Other forms of words have also been used. Thanks to María Victoria Varona García’s research, and now that typographical analysis has been carried out using the Proctor-Haebler method, it is possible to identify the two men in charge of these anonymous printing offices. They were Alonso de Porras and Juan de Porras, members of two generations of the same family.Tradicionalmente, la mayor...