Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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grain layer

That portion of a hide or skin extending from the surface exposed by the removal of the hair or wool and epidermis down to about the level of the hair or wool roots. It is the layer which contains the hair follicles, sudoriferous and sebaceous glands, etc., i.e., the thermostat layer. (363 )

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