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| Keywords: LeatherResearch 002.jpg Cross-section of typical vegetable-tanned leather used for sole leather Note the layer of fine fibers grain at the top through which the hair penetrates and the network of small and large fibers underneath Microscopic examinations of leather are made to study the influence of various tanning and finishing operations upon the structure Class VII- organic and fibrous; 4-leather National Institute of Standards and Technology 1924-01-01 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Leather Leather shoes | ||||
