Method of preserving and storing books and other papers

摘要

Books and other documents that are produced wholly or partly on paper of wood pulp origin are preserved by storing in an enclosed space containing a controlled atmosphere including about 0.05 to 10 ppm ammonia gas. This invention and all United States patent rights thereunder are assigned to the Government of the United States as represented by the Librarian of Congress. The invention described herein may be manufactured and used by or for the Government of the United States of America for Governmental purposes without the payment of any royalties thereon.