HAVANA - After contracting to sell more than $73 million worth of American food to Cuba, U.S. agricultural firms are hopeful they can increase their sales there despite last week's rejection of U.S. visas for Cuban officials interested in negotiating new deals. The United States last week rejected visas for at least three officials representing Cuba's food import agency. It said the Bush administration didn't see any reason for them to visit. Otto Reich, the Cuban-born assistant secretary of state for Western Hemisphere affairs, promised in mid-March that the Bush administration would resist congressional pressure for closer ties with the...