WASHINGTON, April 25 -- The U.S. Postal Service issued the following news release: * * * USPS dedicates powwow Forever stamps at the Gathering of Nations ALBUQUERQUE, NM -- The U.S. Postal Service today dedicated its Powwows: Celebrating Native American Culture stamps during a ceremony at the largest powwow in the country, the Gathering of Nations, with more than 100,000 attendees. "The Postal Service takes great pride in our stamps and the unique opportunity they offer to tell the story of  more