OPACS - Online Bibliographic catalogues
Dictionaries and encyclopedias.
Resources index - Online resources index
Instituitions - Instituitions
Similar instituitions - Similar Institutions related with the April 25th
History e politics - links for internet pages related with the History and Politics of April 25th.
Culture and leisure - Links to internet pages of culture and leisure
Libraries and Digital Archives - Links to internet pages with on-line contents.