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Turning Hard Steel with the Aid of Petroleum as a Lubricant - pp36 - 37
Joshua Rose
doi:10.1038/scientificamerican07151876-36b
Harmony and Discord with Optical Studies - p37
C. F. Brackett
doi:10.1038/scientificamerican07151876-37
New Chemical and Miscellaneous Inventions - pp41 - 42
doi:10.1038/scientificamerican07151876-41d
New Mechanical and Engineering Inventions - p42
doi:10.1038/scientificamerican07151876-42a