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"An Unpublished Letter of Anders Celsius" "An Unpublished Letter of Justus Liebig" "An Unpublished MS on Arab Astronomical Instruments Attributed to Sawai Jai Singh II - A Preliminary Report" "An Unrecorded Medieval Astrolabe Quadrant from c.1300" "An unusual Elizabethan silver globe by Charles Whitwell" "An Unusual Plan of the Universe" "AnalaR" Standards for Laboratory Chemicals. Incorporating improved standards for the Analytical Reagents originally designated as 'A.R.' Analogies of organized beings "Analogy in the History of Science" "Analyse des hypotheses anciennes et modernes qui ont ete emises sur les Tonnerres sans eclairs, par un ciel parfaitement serein ou dans le sein des nuages; accompagnee d'une description des tonnerres sans eclairs observes sous diverses latitudes, et en p
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