The collected letters of Francisco Martinez Negrete Alba are a volume that reunites 319 letters and notes plus three short notes that are written one page in length. Gladys Lizama Silva presents in this book a revision, an analysis, and an interpretation of the written letters sent to children, sisters, nephews, godchildren, friends, fellow businessmen, and acquaintances throughout the course of 17 months from May 1903 to October 1904. The author of this profuse correspondence was a most relevant businessman that supported Porfirio Diaz in Guadalajara, Jalisco, but the correspondence was written after he ruined and lost his economic assets. After finding out about the world of relationships that this businessman had for about two years, it was resorted to the model of social networks because it is an analytical instrument that allows the methodology to be seen as well as the strong-knit social networks constructed by the individual throughout his life. Those networks were useful through the business failure, not only for him but mostly for his political family and kindred. Also, they helped to show the capacity of how bonds within family, friend, and business networks helped with solutions day by day. --Book Jacket.