The Costa Rican archival bibliography 1883-2010 consists of 1247 records and is structured in six sections, the first one corresponds to the antecedents that give rise to it. The second section contains the methodology used to carry out the research. The third contains the chronological index of all references. The index by authors, whether individual or corporate, is developed in the fourth section. The fifth deals with the index for titles, and in the sixth and last section is the index by subject or descriptors.