50 State Quarters to form what is known as a "mule". Only sixteen of these specimens, produced on dollar planchets, escaped from the mint. A 2005 Minnesota double die quarter, as well as a 2005 Minnesota quarter with extra trees (another die error), have both triggered numismatic interest. An unusual die break on some 2005 Kansas quarters created a humpback bison. Relatively more common are Kansas quarters bearing the motto "IN GOD WE RUST." The United States produces proof coinage in circulating base metal and, since 1992, in separately sold sets with the dimes, quarters, and half-dollars in silver. For the silver issues,
District of Columbia and United States Territories Quarters Pride and Hope". The quarter for the Northern Mariana Islands depicts the sea shore, with a latte stone, two fairy terns, a Carolinian canoe, and a "mwar" (head lei). The quarters featuring the territories are what led author Doug Mack to write the book "The Not-Quite States of America" about the U.S. territories. District of Columbia and United States Territories Quarters The District of Columbia and United States Territories Quarter Program was a one-year coin program of the United States Mint that saw quarters being minted in 2009 to honor the District of Columbia and the unincorporated United States insular