The Library of Congress is the world's largest library, preserving nearly 121 million items of all kinds of collections, with more than two-thirds of its books housed in multimedia formats, including many rare books, specialty collections, the world's largest map, film footage, and television footage.

Alibris is an online bookstore, founded in 1997, mainly engaged in new books, used books, music records, video DVD sales and rental services, in 2005 by the New York Times review as "one of the pioneers of changing the consumer market of used books In 2005, the New York Times magazine named the company "one of the pioneers in changing the used book market".

BookBrowse is an online magazine and book review site in the United States, created in 1998, providing book reviews, excerpts, author interviews, online reports and discussion group guides, etc., with a search tool and database of 1700 book reviews, users can search for books by subject, author, format, price range, award-winning, recommended books and bestsellers, and other selective criteria. BookBrowse does not sell books, but offers free and paid content for subscriptions, and now has about 200,000 monthly visitors.