This lexicon doesn't appear to be in print any more and there are two editions: 1st edition set ISBN: 0826703402 (copyright 1988) 2nd edition set ISBN: 0826703437 (copyright 1989), Amazon link I ordered the 2nd edition and the seller sent me the 1st edition by accident. I'm trying to decide if I should return it because the wrong item was sent, or if I should just keep it. The front-matter has different pagination and a different table of contents, but the lexical entry pages (and page numbering) appear to be the same, though I only compared a few pages. I don't want to be too particular, but if there are important differences, then I want to insist on having the 2nd edition. Does anyone know the difference between the two editions? Thanks.