The Yorkshire Archaeological Society, which celebrates its 150th anniversary this year, was established in 1863. For more than a century it has been the leading publisher of archaeological and historical research for the historic county of York. It has also maintained premises housing its library, archives, and other facilities in various locations in Leeds since 1896. The Society, a voluntary organization that relies on investments and the subscriptions of its members for its income, began to take historical documents into its safe keeping in the late nineteenth century. Its holdings increased significantly from the early twentieth century, in a period when there were few public institutions in Yorkshire collecting records, and none doing so on more than a local basis. This situation began to change radically after 1948, as major developments in publicly funded archive services in the three ‘Ridings,’ the administrative divisions of Yorkshire, left a progressively smaller role for the Society to fulfill....