Ever since 1945, when Gabriela Mistral was awarded the Nobel Prize for Literature, the Hispanic Foundation in the Library of Congress had been looking forward to an opportunity to record her voice for posterity. She graciously accepted the invitation, despite her policy of not reading her poetry in public. The Library's recording of the Chilean poet is the only one extant. The materials accumulated since 1943 were acknowledged to be unique and of the highest quality. In 1958 the Library evolved a program for a well-integrated collection of noteworthy Hispanic literature--either verse or prose--on tape. With the aid of a generous grant from the Rockefeller Foundation, a pilot project was undertaken in the same year, September to December inclusive. The salient feature of the project was that the Library commissioned the curator of the Archive, Francisco Aguilera, to visit Peru, Chile, Argentina, and Uruguay and obtain recordings on magnetic tape expressly for the Library of Congress. During September and November 1960, Panama, Guatemala, and Mexico were visited, and in April-June 1961 collecting continued in Ecuador, Colombia, and Venezuela.

The Concise Encyclopedia includes: all entries on topics and countries, cited by many reviewers as being among the best entries in the book; entries on the 50 leading writers in Latin America from colonial times to the present; and detailed articles on some 50 important works in this literature-those who read and studied in the English-speaking world.