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Ralph,
The rock kits sound like a good idea. Thanks, I'll give that a try.....Rob
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Robert C. Thomas, Ph.D.
Department of Environmental Sciences
The University of Montana Western
Dillon, MT 59725
(406) 683-7615
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http://www.umwestern.edu/
http://www.umwestern.edu/envirosci/
"I'll know my song well, before I start singin'"...Dylan