Abstract
Studies carried out in a number of countries have identified about 200 microbic species (fungi and bacteria) which can cause degradation of library materials (paper, parchment, leather, adhesives, etc.). A considerable number of these species make up the aeromicroflora of libraries and archives. This aeromicroflora settles on books and shelves but does not develop and so does not cause damage unless the relative humidity in the room exceeds 65% and the water content of the library materials exceeds 10%. Knowledge of the microclimates in library stacks and the viability of the airspores are thus two essential elements in evaluating the risk of infections to which books are exposed.
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