When we talk about rare books, we speak of books that have a limited supply. There's no single determinant for scarcity. Some books are unique works, like original manuscripts or association copies. Others are considered scarce because the number of interested collectors exceeds the number of copies available on the market. These collections are hand-selected by Biblio's booksellers to represent the best and most interesting of their books from among the millions of titles available on Biblio. We invite you to explore the categories, and learn more about collecting books.