National Archives of Australia An excellent site with advice on caring for books, maps, documents etc. The site also includes valuable information on recovering paper which has been fire and flood damaged and links to suppliers of archival papers, tapes, boxes etc.
Library of Congress USA Frequently asked questions on preservation, care and storage of books etc.
The Australian War Memorial Information on the conservation and handling of Books, Paper, Medals, Documents, Oil Paintings, Photographs and Textiles.
CoOL Conservation OnLine This site is an online resource by & for conservators & related fields, operated by the Foundation of American Institute for Conservation.
Recent Developments in Preservation of works on Paper A PDF of Recent Developments in Preservation of works on Paper by Hugh Phibbs, with numerous photographs. May take some time to load depending on your internet speed but well worth the wait.