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From: Susan Holland (Susan_Holland_at_TeacherArtExchange) Date: Fri Nov 22 2002 - 17:42:55 PST
I use 3/2/2. 3 vermiculite, 2 plaster and 2 water. And the volume this usually yields is about 3 units.
susan_holland@teachnet.edb.utexas.edu
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