<https://9to5mac.com/2011/04/28/al-gores-our-choice-highly-interactive-ebook-hits-the-app-store/#webpage>
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"Al Gore&#039;s &#039;Our Choice&#039; highly interactive ebook hits the App Store - 9to5Mac"
<https://9to5mac.com/2011/04/28/al-gores-our-choice-highly-interactive-ebook-hits-the-app-store/>