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Project Gutenberg''''s Familiar Letters of Chemistry, by Justus Liebig pptx
Project Gutenberg''''s The Chemistry of Hat Manufacturing, by Watson Smith pptx
Project Gutenberg''''s The Doctrine of Evolution, by Henry Edward Crampton pdf
Project Gutenberg''''s The Life-Story of Insects, by Geo. H. Carpenter pot
Project Gutenberg’s An Investigation of the Laws of Thought, by George Boole ppt
Project Gutenberg’s The Foundations of Geometry, by David Hilbert ppt
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