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Robert T. Gunther: A Pioneer in the History of Science 1869-1940 Robert Wilhelm Bunsen Rocenka Technickeho Muzea v Kosiciach, 1968 Roentgen Rays and Phenomena of the Anode and Cathode "Roger Bacon and the Voynich Manuscript" "Roger Bacon" Roger Bacon: Essays Contributed by Various Writers on the Occasion of the Commemoration of the Seventh Centenary of his Birth "Roger Bacon's Gunpowder and His Secret Wisdom" 'Roger Barlow: A New Chapter in Early Tudor Geography' Roger Fenton: The First Secretary of The Royal Photographic Society
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