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United States » U.S. Census » Soundex
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.