Portuguese
O Estado de São Paulo
http://acervo.estadao.com.br/
Contains the digital archive of O Estado de São Paulo, one of Brazil’s most important newspapers, from 1875 to the present.
A Folha de São Paulo
http://acervo.folha.com.br/
Contains the digital archive of A Folha de São Paulo from 1921 to the present.
Diario de Pernambuco
http://ufdc.ufl.edu/AA00011611
The digital archive of the Diario de Pernambuco from 1825 to 1923 hosted by the University of Florida.
Gazeta de Minas
http://acervo.izap.com.br/
The digital archive of the Gazeta de Minas from the city of Oliveira, Minas Gerais from 1887 to 2011, making it the oldest journal in the state.
Hemeroteca Digital Brasileira
http://hemerotecadigital.bn.br/
The digital archive of the Fundação Biblioteca Nacional containing a large number of different newspapers from 1808 to the present.
Jornal do Brasil
http://www.jb.com.br/paginas/news-archive/http://news.google.com/newspapers?nid=0qX8s2k1IRwC&dat=19920614&b_mode=2
The digital archive of the Jornal do Brasil based in Rio de Janeiro from 1891 to 1999.
Journals from the South/Rio Grande do Sul
http://liquid.camaracaxias.rs.gov.br/LiquidWeb/App/Principal.aspx?l=pesquisa&s=pesquisa&Simples=1
Collection of a wide variety of newspapers primarily from the state of Rio Grande do Sul from 1898-2009. To select a title, click on “Arquivo Histórico” > “Jornais de Caixas do Sul – AHMJSA”.
O Nova Friburgo
http://www.djoaovi.com.br/journal.php?id=o_nova_friburgo
Contains the digital archive of the O Nova Friburgo of Nova Friburgo, Rio de Janeiro state from 1904 to 1962, though with significant breaks.
English
Brown Library Historical Periodical Holdings
http://library.brown.edu/gateway/lrg.php?id=30&task=topic&topic_id=3
Link to digital and physical historical periodical holdings of the Brown Library system.
New York Times (Brown only)
http://www.nytimes.com/
http://library.brown.edu/eresources/nytimes.php
The New York Times website is searchable for articles from 1851 to the present. Brown students and faculty can access the digital archive via the second link that contains instructions on how to register.