The University of Puerto Rico (UPR) is contributing materials to the Digital Library of the Caribbean and the Caribbean Newspaper Digital Library from their extensive archives. Materials to be contribute include El Mundo, one of the most important newspapers published in Puerto Rico during the twentieth century (1919 thru 1990). Due to its research value this newspaper is in constant demand by the Puerto Rican Collection users. The years selected for digitalization are 1936, 1937, and 1938. These are approximately 8,500 pages per year for a total of 25,500 pages. The period covered by those years represent a moment of tensions and transformations in the Puerto Rican society. Of grand importance were the political tension that culminated in the political activities taken by the Nationalist Party of Puerto Rico and the birth of the Popular Democratic Party. In addition, this period was still under the impact of the depression reflecting labor unrest among workers. Finally, during this period is taking shape the transformation of Puerto Rico from an agricultural to and industrial society.