The Online Finding Aid for the Archivo General de Centro América will provide increased ways for researchers to identify documents of interest in a widely distributed microfilm copy of this primary resource for the history of Guatemala, Honduras, El Salvador, Nicaragua, Costa Rica, and Chiapas (Mexico). The original archive, located in Guatemala, houses approximately 147,000 registered document collections from the colonial period, ranging in date from the 16th century to independence from Spain in 1821. The microfilm copy, composed of almost 4,000 reels of microfilm, is organized according to basic keywords designating the original province in colonial Guatemala, a year, and a subject-matter keyword. Also associated in the basic records of the finding aid (which are already available online) are the reference number assigned each document in the original archive, and the specific reel(s) on which it is found. With funding from the National Endowment for the Humanities, enhanced records are being created for documents dating between 1700 and 1821 identified as associated with Guatemala, the administrative heart of the colony, for which there are no published indices. Enhanced records add names of people and places not recorded in the original record, opening up the microfilm collection, and through it, the original archive, to broader social history including studies of the roles of women, indigenous people, and African-descendant people.