Hey guys I go to many estate sales with rooms filled with all sorts of old and new books. These rooms completely overwhelm me, so one of my questions is when you walk into one of these rooms how can you tell which are good and which aren't? I know if you don't go through each and every book you may miss something great but unless you have hours to spend this seems impossible. I just picked up a book The Complete Works of Tennyson from 1880 for $2.50 and that was a decent find. However another problem I have is I can almost never find the same copy anywhere online... what's up with that? If I can't find the same one how do I know the exact value? I do have a nice rare book collector next to my house who should know some answers to my questions but I know some of you here will know as well! Share some knowledge! I know nothing about books except if they're old they're cool lol.