I own about a hundred twenty books. Most of my books or PDFs, and I like it that way the portability is awesome but there are some books that you just have to mentally love. I always feel you have to make the book yours. take for instance my copy of the Cherry pickers guide 6th edition volume . I have tagged it. Compiled notes in it. Put lift and it haves Have Nots in subreddits. In the end it really makes it yours . although some of the knowledge may seem redundant. It is still important 2 when you go to coin shows and other events. Here's the thing I don't just do this to one book. I have done this to just about every numismatic book in my collection. Save my Walter Breen catalogue and my Colonial catalogue. If you would like a copy of some of the list that I have compiled or a list of the books in my collection I'd be more than happy to give them to you. From the hobby center and think tank of MTS.LLC