Four major newspaper publishers in the US are teaming to improve ad sales on local newspaper websites, reports The New York Times.

Hearst, Gannett, the Tribune Company and The New York Times Company are banding together under the moniker quadrantONE. Based in Chicago, the entity will sell online ads on local websites owned by those four publishers.

Some of the biggest papers owned by the four members will not be included. Websites for The New York Times, USA Today and the International Herald Tribune will not be available through quadrantONE because of their size.

The entity's goal is to give advertisers easy access to a wide breadth of centrally managed local inventory, without having to court small newspapers one by one.

Companies like MediaSpace and Centro already serve as "centralized" ad networks for local newspaper websites. But from its inception, quadrantONE will have access to 50 million unique monthly visitors.