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But one of the things that I have been frustrated with is the lack of support for ePub books. Often when I search using the eISBN that is printed on my ePUB file the book details are auto-filled with the Kindle Edition. I do delete the “Kindle” and replace with the wording “ePub” but I was wondering if there was a better method?
I understand that Amazon’s MOBI format is a popular format but ePub is also very popular and Library Thing does not seem to support the use. I do not own a Kindle and do not plan to own one since I own over 100 ePub titles. Perhaps if Amazon would allow ePubs on its Kindle device I would reconsider but that does not appear likely.
What is probably happening, is that your book's publisher didn't provide a separate ISBN for the epub and kindle editions. (It's supposed to do so, but its a pain, and in some places ISBN's cost money, yadda, yadda, yadda. Publishers have screwed up catalogers far worse, by reusing ISBNs for two totally different books. Compared to that, two different formats of what is otherwise the exact same eBook isn't bad at all.)
Anyway, the search is finding the kindle edition and not the epub.
...Are you by any chance using Amazon as your source when searching?
As for the best way to deal with it, that would be a matter of personal taste.
I would just switch the Kindle to ePub myself, the odds are good that everything else is exactly the same, and if they aren't I probably don't much care.
But a lot of people here prefer using manual entry so that they can make sure that everything is absolutely right and just as they want it.
Unfortunately no obvious means for writers or publishers to quickly add EPUB editions of new works into this system's database, because LibraryThing does not have any sources from EPUB-baed merchants. The only retail data source I could find is Amazon, which as previously mentioned, doesn't list EPUB books in their catalog. And unless something has changed recently, neither does the Library of Congress. That pretty much leaves random luck with various libraries' catalogs, plus manual entry.
Although I can't say what data sources would be most useful for other authors and publishers, I can tell you what sources I was expecting to see based on my own books. I distribute my Patriots series of books directly to iBooks, Kobo, Barnes & Noble, and Google (Play). Any of those would be ideal choices because they're names that people would think of when searching for eBooks, but all four of those have public APIs available to affiliates that let you query their stores. Any of those would be a big help.
I also ship my EPUBs out via two different aggregators (Smashwords Direct and Draft2Digital), who in turn distribute them via a wide network of distributors like Overdrive and Baker & Taylor, which subsequently distribute them via dozens of other online retailers from Rakuten in Japan to Zoek een boek in the Netherlands. Those distributors almost certainly make their catalogs available, so they would also be possible partners for this website, albeit a bit more obscure and thus less likely for people to find easily.
Finally, all U.S. ISBN data goes into Bowker (Books in Print), and many folks also add their books into the Nielsen Title Editor (for UK distribution). So Bowker's Data On Demand program would be another possible source for ISBN data (and the most canonical one for U.S. books), and I suspect Nielsen has a similar program for UK data.
If anybody responsible for running this site reads this thread, please consider this a feature request. :-)