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You will need to resize the cover images to 3x4 (i.e. 1125x1500). As for the dimensions of a cover image, the aspect ratio is more important. I've seen cover images with aspect ratios ranging from 1x1.1 to 2.4x1 (the last one would be a cover image that was originally 1800 pixels wide by 750 pixels tall). These wider than tall images are often used for omnibuses where they show multiple book spines as part of the cover.
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