The Britannica Concise Encyclopedia 2010 app for iOS 3.0 or later is compatible with iPhone, iPod touch, and the iPad. No internet connection is required to access the more than 25,000 unique articles and 2,700 colorful images and maps. You can save links to favorite articles, see a history of your last 100 searches, view “On This Day” information, and see a random article by shaking your device. The Britannica Concise Encyclopedia 2010 is available worldwide for $19.99 (15.99 EUR) in iTunes.
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$20 seems a bit expensive.