As eschwartz said. The list is self cleaning.
To correct variations there are 2 ways:
1) Open the Tag Browser to the Publisher. Right click: Rename. That will adjust the saved setting for all affected books. If the New Name exists, they will be merged into that entry.
2)Using the Tag Browser to Multi Select a group of Publisher with variations in their name: Select all Results: Bulk Metadata Edit and set the Publisher to what you want. (This assumes that Search is set to only show results)
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