I have a signed addition by Ayn Rand of the 35th anniversary edition of Atlas Shrugged. Copy right 1957 tenth printing. It was my mothers pride and joy. I hate to part with it but at 65 , I have had health issues, the economy ect . I am wanting advice as to where to sell . I have been given no reason to believe the signature is not original but willing to have it authenticated , but also need guidance in that area too . I welcome your input .