The descendants in this book come from various towns in Nueva Galicia which covers the span of nearly 600 years. The towns involved include Aguascalientes, Asientos, Calvillo, and Rincon de Romos in Aguascalientes; Teocaltiche, Santa Maria de los Lagos (Lagos de Moreno), San Juan de los Lagos, Ojuelos, and Jalostotitlan in Jalisco; Nochistlan, Sierra de Pinos and Villa del Refugio (Tabasco) in Zacatecas. There are 246 surnames and these families are listed alphabetically. Common surnames include Alva, Carrillo, Chavez, Delgado, Delgadillo, Fernandez de Palos, Gonzales, Lozano, Macias, Oliva, Perez, Romo de Vivar, Rubalcava, Ruiz de Esparza, Santos, Saucedo, Texeda, Tiscareno and Ximenes just to name a few.