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Official testimonies of the benefits arising from the essence or extract of malt : as used in the British Navy, for making wort at sea consisting of short extracts from the best writers; from medical journals kept on board the King's ships; and from the testimony of surgeons ... / prepared and sold by Holdsworth & Barnard ... under the encouragement and protection of His Majesty's letters patent, granted to the late Mr. Thornton. Public Domain Mark. Source: Wellcome Collection.