Barnes & Noble Inc. makes a variety of Nooks with black-and-white screens, dedicated to reading, and the Nook Color and Nook Tablet, which add color screens, third-party applications and Internet browsing to the mix.

Here's how its sales stacked up against competitors in both the tablet and e-reader market in the October to December period, the crucial holiday season, according to research firm IDC:

Apple: 15.4 million iPads

Amazon.com: 4.7 million tablet-like Kindle Fires, plus 6.1 million black-and-white Kindles

Barnes & Noble: 1 million Nook Tablets and Nook Color units, plus 1.4 million black-and-white Nooks

Samsung: 1.6 million tablets


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