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At nearly all of the American National Park units (and many of the National Park Service's affiliated areas), one or more National Park Passport Stamps (cancellation stamps) can be acquired at no cost at park visitor centers and ranger stations. The stamps serve as a record of each park visit. The Passport program is run by Eastern National, a non-profit organization. The program began in the middle of 1986. Over 1,300,000 Passport books have been sold.[1] In 2006, for the program's 20th anniversary, the "Passport Explorer" was released, featuring a binder and larger pages.[2] Approximately 2,000 cancellation stamps have been issued since the start of the program. Passport stamp ink comes in various colors depending on which of the 9 passport regions one obtains the stamp. The regions (and their colors) are: