Links to related information on other sites:
The Kokopelli Dilemma. The Use, Abuse, and Care of Rock Art
http://palimpsest.stanford.edu/waac/wn/ wn19/wn19-3/wn19-309.html
Calcium Oxalate: A Surface Treatment for Limestone
http://palimpsest.stanford.edu/jcms/issue4/cezar.html
Storage Concerns for Geological Collections (Conserve-O-Gram 11/2)
http://www.cr.nps.gov/museum/publications/conserveogram/11-02.pdf
Care and conservation of carved stone
http://www.conservationregister.com/stone.asp?id=4