From the Wikipedia link —

Clandestine press
The first action of many resistance movements was the publication and distribution of the clandestine press. This was not the case with all movements, as some refused civil action and preferred armed resistance, such as Ceux de la Résistance and Ceux de la Libération. Most clandestine newspapers were not consistent in their issues and were often just a single sheet, because the sale of all raw materials – paper, ink, stencils – was prohibited.

In the northern zone, Pantagruel, the newspaper of Franc-Tireur, had a circulation of 10,000 by June 1941, and was quickly replaced by Libération-Nord which reached a circulation of 50,000. By January 1944, Défense de la France was distributing 450,000 copies.[125]

In the southern zone, François de Menthon’s newspaper Liberté merged with Henri Frenay’s Vérité to form Combat, in December 1941, which grew to a circulation of 200,000 by 1944.[126] During the same period, Pantagruel published 37 issues, Libération-Sud published 54 issues and Témoignage chrétien published 15.

The underground press of France published books as well as newspapers through publishing houses such as Les Éditions de Minuit (the Midnight Press)[127] which had been begun in order to circumvent Vichy and German censorship. The novel Le Silence de la Mer was written in 1942 by Jean Bruller, and quickly became a symbol of mental resistance through its story of how an old man and his niece do not speak to the German officer occupying their house.