Common, scarce and rare Cook Islands currency (paper money; bank notes [also, banknotes]) at Mintmark.com.

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"The dollar is the currency of the Cook Islands. The dollar is subdivided into 100 cents, although some 50 cent coins carry the denomination as 50 tene Until 1967, the New Zealand pound was used on the Cook Islands, when it was replaced by the New Zealand dollar . . . In 1987, 3, 10 and 20 dollar notes were introduced by the government, followed by 50 dollars as part of a new series of notes in 1992. These notes were issued until 1995. Cook Islanders are showing a preference for New Zealand banknotes, although the Cook Islands notes remain legal tender . . ." — Cook Islands dollar at Wikipedia