This booklet has been prepared within the framework of the Religious Culture and Ethics (5th grade) curriculum put into practice by the Ministry of National Education since 2000-2001 and serves as a guide for teachers and students. Because the new program was put into effect in June (Journal of Notifications numbered 20001-2525), the "Religious Culture and Moral Knowledge Books", which were used to teach in the academic year 2000-2001 (according to the old program), can not be used in this academic year (2001-2002)
(Colección de Textos de Historia para las Escuelas Primarias Mexicanas). Aparece en: Francisco Ziga, "Bibliografía Pedagógica. Libros de texto para enseñanza primaria:1850-1970 V. Libros de Historia" en Boletín del Instituto de Investigaciones Bibliográficas 1981-1982, Biblioteca Nacional, Hemeroteca Nacional, Universidad Nacional Autónoma de México, Nos. 18 - 19, p. 84.
