On this site, the book comments are not enough to ensure the book is first edition. Many source sites as well as this one, mostly use the dust cover to identify the book as first edition. If someone has a first edition book with a good dust jacket, but the book is defect in some way... They could put the jacket on a BCE and past it off as a first edition. For example, if you were to purchase one these books, it would meet all the first edition attributes listed here. I have both books and the only difference I can find is the way the library cataloguing information is presented. The best way to provide the best information possible is to show the CP page for a first edition. Just my thoughts..