"Often researchers miss records that are indexed under nicknames, especially in states such as Pennsylvania where the system of sub- indexing by first name in court records in prevalent. The searcher who looks in the 'A' sub-section of the 'J' surnames for Alexander Jones but fails to check the 'S' sub-section for Sandy Jones may miss important records. It is also on major importance in searching soundex census, indexed by first names" -- Introd.