Two more US newspapers have announced plans to publish their final print editions, but will continue operating online, part of a growing trend that has shaken the news industry. Arizona's oldest continuously published daily newspaper, the Tucson Citizen, will publish its final print edition Saturday. The Ann Arbor News in Michigan plans to publish its last newspaper on July 23. Many newspapers across the country are struggling to survive mounting losses as readers have migrated to the Internet, advertising revenue has declined drastically and circulation has fallen. Kate Marymont, Gannett Co. vice president for news, told Tucson newspaper's staff Friday that the paper will continue with a Web site edition providing commentary and opinion but no news coverage.