@EllenInEdmonton @kimlockhartga @bookstodon Just a heads up that not *every* book does have an ISBN, anywhere. I'm not sure when the ISBN system started, but books from before 1950 more often than not don't (especially if not printed in the UK or US) , and adoption of the system seems to have become truly universal only in the last couple of decades. I know this from having tried to find ISBNs in several older pbooks