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Description: If certain types of hardboard situated between the outer and inner covers of the binders have a moisture content, this may give rise to the development of a certain type of mold resulting in a short space of time in the powdering of the hardboard and the rotting of the leather or the leather cloth external cover. The appearance of the cover may well lead to the conclusion that the outer cover has been wetted at some time, this usually being in a stained condition coincident with the dampness of the hard- board. When attributing a cause for such damage, care should be taken to determine whether the dampness came from an external cause.
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