DUBUQUE, Iowa, June 29 -- The National Mississippi River Museum and Aquarium issued the following news: The Dubuque County Historical Society, which operates the Mathias Ham House, was awarded a $270,000 Challenge Grant from the Jeffris Family Foundation after completing its fundraising efforts for the matching $540,000 for the project through the Preserve the Wonder Capital Campaign. The $810,000 will support the restoration, preservation, and interior improvements to the house and its mechani  more