The problem is formulated to define the role of book paper lamination by a polyethylene film to prevent fungal deterioration. Four estimate techniques for the resistance to three species of fungi were taken, namely, determination of the gaseous products of destruction, infrared absorbtion spectra, alkali-soluble cellulose fraction in book paper, and respiratory quotient of the fungi growing on samples. It is found that fungal growth is inhibited by paper lamination to some extent but this never provides biological resistance of documents in storage. Paper stabilization with respect to the biological factor is necessary prior to lamination. -- AATA