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United States » U.S. Census » Soundex

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NOTE TO RESEARCHERS: Please be aware that a formerly "lost" rule for calculating Soundex codes has been rediscovered. This rediscovered rule is called the "Ashcraft" or "H & W" Rule. In addition to the existing Soundex calculation rules, add:
If "H" or "W" separate two consonants with the same soundex number, the "H" or "W" is disregarded, and the second consonant is not coded

The Soundex Indexing System web page on the National Archives site has been updated to include this previously "lost" rule. Not all of the links below include this extra rule. Use the National Archive's Soundex page as your definitive source.


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