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Keywords: LeatherResearch 023.jpg The conditions of walking are approximated by having the test pieces travel in a circular path on the surface of an abrasive disk Class VII-organic and fibrous; 4-leather National Institute of Standards and Technology 1919-01-01 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Leather Leather shoes |