According to a bookseller, the selection criteria are extremely broad:
The dealer himself describes these books as worthless. The only way I can explain this is that he’s trying to justify his questionable sale in hindsight.
Quote:The focus was specifically on non-fiction titles published after 1970 with ISBN numbers.
The dealer himself describes these books as worthless. The only way I can explain this is that he’s trying to justify his questionable sale in hindsight.