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How Machinery Increases Beneficial Labor - p125
doi:10.1038/scientificamerican12291855-125
Manufacture of Iron—Hot Blast; Saving of the Waste Gases - p125
doi:10.1038/scientificamerican12291855-125b
Opposition to Inventions and Discoveries - p125
doi:10.1038/scientificamerican12291855-125c
Preparation of Gun Cotton for Collodion - p126
doi:10.1038/scientificamerican12291855-126c
Who was the Inventor of Steam Locomotives? - p126
doi:10.1038/scientificamerican12291855-126f
