This website compiles, by year, four different lists of books published during the twentieth century: 1. The top ten bestsellers in fiction, as recorded by Publishers Weekly. 2. The top ten bestsellers in nonfiction, also as recorded by Publishers Weekly. 3. The main selections of the Book-of-the-Month Club, which was founded in 1926. 4. Critically acclaimed and historically significant books, as identified by consulting various critics' and historians' lists of important books.