Ira Kane: Ira Kane, head of the science department, Glen Canyon Community College.
Harry Block: Harry Block, United States Geological Survey.
Wayne Grey: Wayne Grey. Did some chemistry in high school.
Harry Block: Harry Block, United States Geological Survey.
Wayne Grey: Wayne Grey. Did some chemistry in high school.
Ira Kane : Ira Kane, head of the science department, Glen Canyon Community College.
Harry Block : Harry Block, United States Geological Survey.
Wayne Grey : Wayne Grey. Did some chemistry in high school.
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