It is one of two major sources that cover the Yaqui Wars. A number of editions of major works on the history of Mexico appeared after his death, including the following titles: Historia y conquista espiritual de Yucatán, de fray Bernardo de Lizana, México, 1892; Biblioteca nahua, 6 v., Florencia, 1899-1909; Historia de las cosas de la Nueva España de fray Bernardino de Sahagún (Primeros memoriales, Códice matritense del Real Palacio y Códice de la Real Academia de la Historia, textos de los informantes de Sahagún), 3 v., Madrid, 1906-1907; Papeles de Nueva España, 7 v., Madrid-México, 1905; Códice Mendocino, México, 1925; Crónica de Nueva España, del doctor don Francisco Cervantes de Salazar, 3 v., Madrid-México, 1914-1936; Epistolario de la Nueva España, 16 v., México, 1939-1942. Some of his other contributions include: Los libros de Anáhuac, México, 1895; Comentario al Códice Borbónico, Florencia, 1905. Del Paso y Troncoso is a major figure in Mexican historiography, tirelessly tracking down manuscript materials in archives in Mexico and throughout Europe. He was "certainly the most erudite Mexican specialist of his era, [but] he allowed this deep knowledge to imped rather than advance his own direct contribution. He published just a fraction of what he had collected, since he meticulously edited and annotated the primary texts. A number of his works appeared after his death in "subprofessional dress...in untrustworthy editions" published by others. Some of Del Paso y Troncoso's work was widely considered to have published under another's name. By contrast, Mexican historian Silvio Zavala capably edited and published 16 volumes of Del Paso y Troncoso's "Epistolario de Nueva España" (1939-42).