This was a great help to me, latepaul. It took me a while to appreciate that 'merging' in Calibre means going to the 'second library' and choosing all the books you want to merge in the 'first library.' A right click brings up the 'copy' command, which you can then point to the 'first library'. A nify help is found in 'Preferences' (Adding Books/Adding Actions) . . . where you can choose to merge duplicates. That saves a lot of work.
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