CRL has received almost all of the volumes of the 1961 (10th) and 1971 (11th) Censuses of India and is acquiring the 1981 (12th) and 1991 (13th) censuses as volumes are issued. Each census is arranged with Series 1 covering all India, and Series 2, etc., for the states and union territories, with one series for each state or territory. Each series is issued in parts including the following topics: