Dear Nancy - You didn't mention whether you have any air conditioning in
your building, nor where the building is. If it's in a part of the world
where you are likely to have hot humid conditions outside, you will want
to keep your RH below 60%; an additional way to help keep mold from
growing further on your collections is to keep the air moving. A
dehumidifier will lower the humidity, but in such a small sealed space
it will also raise the temperature, so fans would help keep the place
bearable for you as well. Ideally, you might find out if another local
institution has dataloggers (or an old, unused hygrothermograph) you
could borrow to measure your conditions once you've installed your
grant-funded dehumidifier and fans. If you lower your humidity too fast
or too much, that can also damage your collection. 

I'm sure you'll get lots of other advice, too - I hope this helps.
Anne

Anne T. Lane, Collections Manager
Charlotte Museum of History
3500 Shamrock Drive
Charlotte NC 28215
704-568-1774, ext 110
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