The United States Mint has announced the designs for the next four coins in its decade-long series of one-dollar coins featuring American presidents. James Monroe, the fifth president, will appear on Feb. 14, followed at three month intervals by John Quincy Adams, Andrew Jackson and Martin Van Buren. The Mint is also redoubling its efforts to get the public to use more of the dollar coins, which are the same size and color as the Sacagawea dollars first issued in 2000. A test program in the Washington, D.C., area is trying to encourage businesses to use more of the coins and is gathering feedback about why they might be resisting. The Mint turned out 800 million presidential $1 coins in 2007.