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Quite a few of the back issues are also in image PDF, as opposed to text PDF, being essentially scanned copies. Converting those to text is non-trivial, especially if there are tables that change page orientation, complex formulae, etc. I think it will be a long time before such documents are available in a format like DE, if ever. It might be financially worthwhile for some to be converted, but probably not most of the ones that were never properly converted to text (i.e. OCR'd) in the first place.
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