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Wear of the System by Railway Traveling - p283
doi:10.1038/scientificamerican05151858-283
The American Association for the Advancement of Science - p285
doi:10.1038/scientificamerican05151858-285b
How to Cut a Piece of Leather which will Exactly fit a Cone Drum - p286
doi:10.1038/scientificamerican05151858-286a