Most print issues of L'Illustration, a popular newspaper of the 19th and early 20th century, are available at the John Hay (1846 - June 1914) or at the Rock (July 1914 - 1944).
The Dreyfus Affair periodicals collection is a small collection of popular weekend supplements to newspapers (1891 - 1906).
Gallica - Presse et revues Many French historical periodicals available starting in the 18th century. Ability to search keywords in texts.
Libération is available online from Eureka.cc.
L'Humanité is available online from Eureka.cc.