A West Virginia newspaper company is suing Google and Facebook, accusing the tech giants of monopolizing the digital advertising market.

HD Media, which owns the Pulitzer Prize-winning Charleston Gazette-Mail and other papers in the state, filed a 42-page complaint in the U.S. District Court for the Southern District of West Virginia on Friday, according to Editor & Publisher, a trade magazine covering the newspaper industry. The suit is believed to be the first of its kind filed by a newspaper company against the Silicon Valley companies for monopolistic practices.