Harris brand National Park Quarters Folder, 2010 through 2021, 60 Openings, Holds P & D Mint Quarters. The National Park Quarters Coin Act of 2008 - Requires quarters, beginning in 2010, to have designs on the reverse depicting one national site in each state, the District of Columbia and territory of the United States. HE Harris & Co#: 2881. Size: 6x7.75.