In the 1990s, Walmart sold a series of classics for 2 for $1. All these books have the same ISBN (1559029870) and are difficult to enter into the Goodreads database. Rather than add this book to your bookshelf, please do one of the following: 1) Search for the author and title of the book you want to add and just add a different edition. 2a)Search for Walmart and the title In the 1990s, Walmart sold a series of classics for 2 for $1. All these books have the same ISBN (1559029870) and are difficult to enter into the Goodreads database. Rather than add this book to your bookshelf, please do one of the following: 1) Search for the author and title of the book you want to add and just add a different edition. 2a)Search for Walmart and the title and/or author of the book you want to add and see if someone has created an entry for that specific book. Walmart should appear in parenthesis after the title and the ISBN field should be blank with the ISBN mentioned in the description. 2b) If no one has already created an entry for the Walmart Classics version of your book, you may create one in the Goodreads database. Just be sure to place Walmart in parenthesis after the title and leave the ISBN field blank and enter the ISBN somewhere in the book description field. See this link for an example of a properly created version of one of these Walmart Classics.