Abstract
In this article is analyzed the written thought of university professor Alicia Perales Ojeda, who strove to create, develop and improve the teaching and research in librarianship within the Faculty of Philosophy and Letters at the National Autonomous University of Mexico during the second half of the 20th Century. The analysis is centered around the books she published and which now are a notable part of university library science literature from Mexico and Latin America. Thus, through this analysis the thematic profile and value of general and specific, central and peripheral, related and opposed, traditional and innovative concepts are appreciated, which Perales studied in her works. The main topics discussed in this article are: organization of library services, reference works, bibliographic information services, library information networks and Mexican bibliography.
