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    Works in this collection may only be used, with full acknowledgement, for the purposes of research and study and education. They may not be used for commercial purposes without prior permission from the University of Sydney Library.
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    Letter from Frederick E Brasch, Chief of the Smithsonian scientific collection to Barbara Bruce Smith in January 1943, requesting for copies of pages from Principia for his research

    Letter from Frederick E Brasch, Chief of the Smithsonian scientific collection to Barbara Bruce Smith in January 1943, requesting for copies of pages from Principia for his research
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