This book presents an exhaustive analytical history of the great Spanish publishing house Editorial Gustavo Gili, specifically the scientific and technological works in its catalogue that were published during the years of the Franco regime. The history recounted in the book, however, is rather unconventional, a cultural history that analyzes the publishing house through its publications and how they took shape in the hands of the actors involved in their preparation during the different phases of production, promotion, and sales. All these concerns are taken into account in a work that establishes science on paper, examining the myriad issues related to the reception and reading of technical books in Franco’s Spain.