I went to all the previews, signed autographs for many, many hours at a time.
Here are a few tips to help avoid buying one of the many fake autographs on ebay.
The municipal library, with 300,000 volumes, boasts among its rarer treasures a Gutenberg Bible printed at Mainz between 1450 and 1455, another on parchment dated 1462, the Institutiones Justiniani (Mainz, 1468), the Theuerdank, with woodcuts by Hans Schaufelein, and numerous valuable autographs.
Mount Everest The British Story - Colin collects autographs relating to climbers of Mount Everest.
No doubt then Aristotle's library contained published copies of the works of other authors, as well as the autographs of his own.