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The School Environment
In the United States there are about 120,000 schools providing for the educational needs of approximately 54 million students. On average, students receive about 20% of their environmental exposure in schools.
Dr. Michael A. Berry
Ragweed pollen(Ambrosia psilostachya). This pollen is an allergen.
Copyright Dennis Kunkel Microscopy, Inc.
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Dennis Kunkel Microscopy, Inc.
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