This is a guide to materials and research on Puerto Ricans who have returned to Puerto Rico after living in the United States. Part 1 is an annotated bibliography of books, journal articles, printed documents, doctoral dissertations, master's theses, journalistic accounts, and unpublished papers on characteristics of Puerto Rican return migrants; their sociocultural, language, and educational adjustment problems in the United States and upon their return to Puerto Rico; employment experiences; and their economic and social impact on American and Puerto Rican societies. Part 2 is an inventory of completed, current, and planned research on the characteristics, language and educational needs, and self-concept of return migrant students; return migrants' employment patterns; and demographic, social, and economic influences and effects of return migration. Information provided on each study includes the investigator's name, sponsoring institution, funding source, completion date, and a description of the research. An author index and a directory of persons involved in Puerto Rican return migration studies are appended. (MJL)