They weren't transcribed, Nell, it was done using OCR software. If you look at the total number of records in the database - 159,232,274 - it would have taken an enormous number of transcribers (or a very long time!) to transcribe them by hand. It isn't very accurate but in many cases, the same person will be at the same address for several years and once you have found them in one year you know where to look.
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