Miracode system: An indexing system similar to Soundex that was used to organize the results of the 1910 census. Miracode index cards are computer generated rather than handwritten, and are organized first by Soundex code, then alphabetically by county, then alphabetically by given name. (Definition from familytreemagazine.com)
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Soundex: A system of coding surnames based on how they sound, which was used to index the 1880 and later censuses The Soundex system is useful in locating records containing alternate surname spellings. Soundex cards are arranged first by Soundex code, then alphabetically by given name, then (if necessary) alphabetically by place of birth.