The University Archives hold a range of material dating from the 1920s relating to the history of The Australian National University and its predecessors. This material is available under a 30-year rule (progressing to a 20-year rule by 2021) which means that records up to the mid-1990s can be generally used for research. The collection includes minutes of the ANU Council and other University committees, correspondence files, photographs, plans, and publications such as annual reports and the ANU Reporter. The papers of academic and senior staff of the University and University organisations are also part of the University Archives. The acquisition of material is governed by a collecting policy.