Once again, please allow me to recommend - and for all such
questions - "Conservation OnLine," or "CoOL." Find it at
            http://palimpsest.stanford.edu/
(Note the ultimate slash - won't work without it.)
Go into the "Conservation DistList Archives." Practically
everything (except perhaps for such things as preserving ice
sculptures in the tropics without refrigeration) is a FAQ.
Those lacking WEB access may find ConsdistList at
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This is moderated list. Moderator is Walt Henry. I do not get
kickbacks or finders' fees from him