California Birth Index
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INDEXING OPTIONS
(created on the last name only)
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Soundex A code created by using the first letter of the name and encoding the remaining consonants into three numbers. This code was used for some U.S. Census indexes.
Metaphone A more advanced code based on phonetic sounds of the letters.
Double Metaphone A variation of Metaphone to take into account foreign names.
NYSIIS A code developed by New York State for this criminal database system.