Hi Jennifer.
You might be interested in the Virginia Association of Museums... that's about
as mid-Atlantic as you can get. Their number is: (804) 649-VAM1
There is also the Southeastern Museums Conference which covers some
mid-Atlantic states. (504) 383-5042.
Hope that helps.
Mark C. Vang
Freya Ventures
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Interactive touch-screen computer exhibits for museums, science centers and
aquariums.