The St. Peter State Hospital Collection is divided into four series: General Hospital History, 1856-1974; Buildings and Grounds, 1855-1972; Library, 1867-1972; and Volumes, 1866-1952. These papers were originally collected by the institution's librarian, Elizabeth Seaquist. Seaquist's basic organization has been retained.

General Hospital History, 1856-1974 This is the most extensive series within the collection. It contains information on the hospital ranging from newspaper chppings, photographs, correspondence, reports, research notes, newsletters, and numerous other items. Some subjects included are the hospital's centennial celebration, hospital programs, hospital history, and AFSCME strike materials.

Buildings and Grounds, 1855-1972 The buildings and grounds section contains photographs, blueprints, and information about the institution's property and facilities.

Library, 1867-1972 The information about the library pertains exclusively to the library's collections and activities. This section includes numerous photographs of events and individuals along with correspondence and reports.

Volumes, 1866-1952 The volumes contain information regarding the institution's spending proclivities, daily work records, and patient account records in addition to other information.