Ugh, so it sounds like it's basically all manual, which is sort of what I expected. I always ensure my books have copyright info so I'll have that to grab the publisher; and where it's missing, I'll try and create one from an image from OpenLibrary or eBay listings.
Thanks for the suggestions everyone. I'll have to just do my best to represent the publisher as best I can and weed out the worst aberrations.
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