The Cambridge Room at the Cambridge Public Library has a vast storehouse of material related to the history of this most historic American city. Recently, they have allowed the staff at the Internet Archive access to a variety of materials, resulting in a number of primary documents that now reside on this site. Here, users can access the annual Cambridge business directories which profile local business leaders, institutions, organizations, and much more. These very substantial volumes contain advertisements, address directories, and other pieces of information that document the ebbs and flows of the business community throughout the area. The dates range from 1884 to 1931 and users can search through each volume for key words, addresses, names, and dates.