This collection comprises antiquarian booksellers' catalogs dating from 1918 to the present. Most of these catalogs were issued by American and British booksellers, though some French and German booksellers are also represented. The large majority of these catalogs were collected over time by the Clark Library, which receives mailings and catalogs from booksellers on a regular basis and retains these for reference purposes. Most booksellers represented focus on British antiquarian books and manuscripts as well as book arts, as these are major collecting areas for the Clark Library, but other subject areas are also represented by the catalogs gathered here.