Currier · 1976 · New Research on the Voynich Manuscript: Proceedings of a Seminar, 30 November 1976
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The March draft says it was presented at a "New England Voynich Conference"; it was given at the 1976 NSA seminar in Washington (D'Imperio, ed.). PDF is the whole NSA seminar proceedings (declassified US government work); fetched from the Wayback Machine copy of media.defense.gov, which blocks direct downloads.