Abstract
The authors, members of Century Mexican Bibliography Seminar from the Institute of Bibliographical Research, present to us the registries of 18 periodical publications that correspond to the period between the years of 1822 and 1855, kept by the Reserved Fund of the Biblioteca Miguel Lerdo de Tejada. Ten of these periodicals come from Mexico City, five from Guadalajara, two from Zacatecas and one from Toluca, each one manifesting itself as an ally or enemy of the politic currents in turn (liberals and conservatives) of the newly independent Mexico. Liberal periodicals such as El Jalisciense, El Monitor constitucional or El Fénix zacatecano gave impulse to the federalist or liberal system, while publications like El Tiempo or La Sociedad shared the ideas of the conservative or centralist party. Either way, the revision of those periodicals shows the reader the pan that the press played in the unstable times of post independent Mexico.