During a period of 10 years, from 1999 to 2008 USA will issue a quarter dollar coin commemotating each of the states. Each 10 weeks a new issue and each year 5 new states. The coins are issued as the different states joined the union. Each coin has a special design for the state. The coins are minted both in Denver (D) and Philadelpia (P)
Coins issued like Proof and Silver Proof, please see USA under "Coins sets from USA"