From the Women in Comics Wiki:
Ah ! Nana was a French comics magazine published from October 1976 to September 1978, running nine issues. It was published by Humanoïdes Associés, best known as the publishers of Métal Hurlant, or Heavy Metal. It was the first French publication featuring work entirely by women (though each issue invited one man to contribute) at a time when comics were still almost exclusively male environments. It included work by such French cartoonists as Chantal Montellier, Florence Cestac, and Nicole Claveloux, as well as Americans such as Trina Robbins. It sold 15,000 copies on a print run of 30,000, before the ban on sales to minors proved fatal, due to its frequent taboo and controversial material.
Women in Comics: Ah ! Nana has covers and a history of the publication.
Previously: Leah Moore on Women in Comics