http://www.ups.edu.ec/ Download this publisher's e-journal holdings (xlsx) Content Type OA ? PCA ? Journals Yes N/A Request a holdings comparison Portico provides a free holdings comparison service to compare a library’s journal or book holdings to the Portico archive. Search titles and ISSNs by keyword: Show: E-Journals All0-9ABCDEFGHIJKLMNOPQRSTUVWXYZ Titles start with R (1) ISSN Status Retos, Revista de Ciencias de la Administracion y Economia 1390-6291, 1390-8618 preserved