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"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
Roger Joseph Boscovich S. J., F.R.S., 1711-1787: Studies of his Life and Work on the 250th Anniversary of his Birth
"Roger Sherman's Field Survey Book: Richard Norwood's Epitome"
"Role of the Intellectual in Public Bureaucracy"
Rolfe Family Records : 2 entries
Roll of commissioned officers in the Medical service of the British army: who served on full pay within the period between the accession of George II and the formation of the Royal army medical corps, 20 June 1727 to 23 June 1898, with an introduction sho
Roman and Islamic Water-Lifting Wheels
Roman Science
"Romer, Flamsteed, and the Search for a Stellar Parallax"
Romische Sonnenuhren aus Aquileia
"Romische Vermessungskunst: Ihre Instrumente und Verfahren"
Rontgen Rays Centennial: Exhibition on the Occasion of the Discovery of X-Rays in Wurzburg on November 8, 1895
Rontgenstrahlen: Zum funfzigjahrigen Jubilaum ihrer Entdeckung
"Rosenholm"
Rotary Specialities: Price List November, 1908
Rotary Stripping Pigment Films for Three Colours
Rotatoria of the United States, with especial reference to those of the Great Lakes
"Rothamsted: 1843-1943"
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