I've noticed that recently amazon.com has stopped showing old editions of books when you do a search, it only gives the latest edition. I don't know if this is done for all books, but I've certainly noticed it quite often. What a pity. For example, when I was an undergrad I remember using the 1st edition of Bransden and Joachain for QM (very good book, btw) because I thought it was much better than Griffiths. So now I went to amazon.com to look for this book because I'd like to brush up on my QM; lo and behold: https://www.amazon.com/s/ref=nb_sb_...-keywords=bransden+joachain+quantum+mechanics Only the 2nd edition is given. Not even adding '1st Edition' to the search helps. I also distinctly remember reading a few years ago the reviews for the first edition of this book on amazon. From what I could gather the editions may be different. Now I wonder how different is the 2nd edition and if I should get it or not. Where has that 1st edition and its reviews disappeared to? Anyway, my point is not to discuss this book, but that amazon is not showing old editions of books. I've also noticed this for quite a few other books. Together with the fact that many reviews on amazon seem not to be worth much, I find myself visiting it less often.