Goodreads Librarians Group discussion
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ISBN makes book suspect
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ETA: Is there anything outside of the Wikipedia article that makes you question the original publication date? If you Google "The Bafut Beagles 1950" there are several hits including the ability to buy the 1950 edition on B&N and Amazon. It's possible that it was a limited first run or something of the sort and it was printed for a wider audience in 1954.

Since the ISBN data in the GR record for this supposed 1950 edition is only validated in the non-LOC ISBN lookup sites, which I've read in other threads are sometimes fishy, should I just leave the record as it is with the ISBN intact, but make a note about the questionable ISBN attribution in a librarian note? Or is there something else I should do?

There's really not much else to do, since it is virtually impossible to prove that something didn't exist. If you really want to you could try contacting the publisher. They might be able to confirm whether that ISBN was ever actually used. (Though given the age they might not have the appropriate records anymore.)
http://www.us.penguingroup.com/static...
(Viking is now a part of the Penguin Group.)
http://www.goodreads.com/book/show/11...
makes it look kind of suspect. There's nothing with those ISBNs in WorldCat or LOC, but a search on isbndb.com and lookupbyisbn.com yields an edition of the book that was supposedly published several years before the generally acknowledged first edition.