18 microfiche; An analytical guide to select material, such as archaeological or historical series. Arranged by years and subject matter. Patrons using this will find new items of genealogical information not listed in the computer or film guides. The years from 1900 back to 1500 are divided into 50 year periods. >From 1500 back to Saxon times (1066), the increments are in 100 year blocks. Compiles by Frank Smith, # 6110527, 18 microfiche, which will stay at the library where they were ordered from indefinitely. Good Hunting.