But it estimates that upwards of 150 million Americans are collecting the 50 commemorative quarters, which is creating an unprecedented demand.

The act directed the Mint to study whether a series of commemorative quarters would be successful.

The Old Man of the Mountain appeared on New Hampshire's license plates, road signs and commemorative quarter.

New York's commemorative quarter, to be issued next year, will feature the Statue of Liberty, it was announced this month.

In 2004, two separate commemorative quarters were minted.

New Jersey and Connecticut, as two of the first five states admitted to the union, will have their commemorative quarters minted first.

The 1999 Yellowstone National Park commemorative quarter was the August 1999 Coin of the Month.

In 2005, to celebrate the centennials of the provinces of Alberta and Saskatchewan, two commemorative quarters were issued.

Other states have had their own problems with the commemorative quarters, which are being introduced in the order in which the states joined the union.

Isabella was also the first named woman to appear on a United States coin, an 1893 commemorative quarter, celebrating the 400th anniversary of Columbus's first voyage.