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• The Complete Soundex Guide

  A book by Willis I. Else. Includes the H & W rule.

• The WPA Census Soundexing Projects

  By Claire Prechtel-Kluskens for Prologue, the quarterly of the National Archives and Records Administration.

• U.S. Federal Census - What is Soundex?

• Using the Soundex with Census Records - Ancestry.com Wiki

• What is Soundex?

  Using the Soundex Coding System.

• Yet Another Soundex Converter (YASC)

  Updated with the H & W rule.