The collection of census data on microfilm, known by its series title International Population Censuses, is arranged in three segments. Segment I contains material from 1945–1967. Segment II is a retrospective collection of materials published prior to 1945, and includes rare data from censuses taken as early as the sixteenth century. Segment III consists of post-1967 census data.
Aids will help identify the box and reel numbers needed for particular countries and years.