Remember what ever metod you use the books must be absolutely free of moisture. When the tomb of Charlemain was opened several hundred years after his death they found two copies of his will. One placed in a glass container and sealed tight the other left in a vellum pouch on the body. The sealed containers contents loked like soup the moisture having condesened and destroying the document. The pouched docment was relativly intact if a litle stained.
Dessicant is stringly recomended.