Per the most recent retention schedule (adopted 2008 December 9), this file classed as part of the series: Districts (BDSU-0280). Records in this series are described as: Records track establishment and changes in county service, special, assess, school and supervisorial districts. Includes: annexation, reorganization, detachments, formation, withdrawals, boundary changes, exclusions and dissolutions, LAFCO resolutions, maps, description, etc.