Regarding cover availability and selection. I've noticed that downloading by selecting books in the GUI Library list then downloading covers, the grab seems to be of the first cover it finds. Selecting just one book in the list then going to the Edit Metadata window and clicking the Download Metadata button, sometimes that shows a list of the same title by different publishers or different editions. Selecting one of those and clicking Next button, you'll see covers that are available from whatever metadata sources you've selected in Preferences/Metadata Download. There are also some plugins for grabbing metadata from various other sources.
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