Ashfall Zone: Introduction

Volcanic ash blanketed forests downwind of Mount St. Helens. Long-term studies are revealing how understory vegetation has responded.

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USGS / Robert Krimmel USFS USGS / Lynn Topinka University of Washington / Jerry Franklin USFS / Jim Hughes USFS / Peter Frenzen Robert Parmenter USFS / Peter Frenzen University of Victoria / Joe Antos USFS / Peter Frenzen Oregon State University / Don Zobel University of Victoria / Joe Antos Oregon State University / Don Zobel Oregon State University / Don Zobel Oregon State University / Don Zobel Oregon State University / Don Zobel Matt Blakely-Smith USFS / Peter Frenzen USFS USFS USFS USFS
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